Non Erasable Retractable Pens Pens

Poppin Luxe Retractable Gel Pen, Fine Point, Black Ink, 6/Pack (100086)~#|#~s0854458_sc7Poppin Luxe Retractable Gel Pen, Fine Point, Black Ink, 6/Pack (100086)~#|#~CDC94FAC-B175-4C30-94ECBDDE0B38ED50_sc7
Item: 1148672
Model: 100086
Price is $12.00
Unit of measure 6/Box Price per unit $2.00/Pen
Delivery by Wed, May 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Zebra Sarasa Gel Retractable Pens - 0.7 mm Pen Point Size - Refillable - Blue Gel-based Ink - Translucent - 36 / Pack (ZEB46236)~#|#~m003171070_sc7
Zebra Sarasa Gel Retractable Pens - 0.7 mm Pen Point Size - Refillable - Blue Gel-based Ink - Translucent - 36 / Pack (ZEB46236) is New at Staples
Item: ZEB46236
Model: ZEB46236
Price is $54.53
Unit of measure 36/Pack
Free delivery by Thu, May 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Poppin White Retractable Gel Luxe Pen, Black Ink, 100/Set (104290)~#|#~sp97532337_sc7Poppin White Retractable Gel Luxe Pen, Black Ink, 100/Set (104290)~#|#~sp97532336_sc7
Item: 24395001
Model: 104290
No reviews yet
Price is $232.79
Unit of measure 100/Set
Free delivery by Wed, May 27
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
EnerGel Deluxe RTX Retractable Gel Pen, 1.0 mm, Blue Ink (PENBL80C)~#|#~E0BB5F6D-C4B9-4B4F-8726997737AC100A_sc7EnerGel Deluxe RTX Retractable Gel Pen, 1.0 mm, Blue Ink (PENBL80C)~#|#~F2FE9994-D868-4EDE-BDE4F46D91F170EB_sc7
EnerGel Deluxe RTX Retractable Gel Pen, 1.0 mm, Blue Ink (PENBL80C) is New at Staples
Item: PENBL80C
Model: PENBL80C
No reviews yet
Price is $5.29
Delivery by Wed, May 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
uniball Signo Gel Impact Pens, Bold Point, 1.0mm, Assorted Ink, 3/Pack (1919997)~#|#~B56A8672-43B8-4392-8B3D4B177A718456_sc7uniball Signo Gel Impact Pens, Bold Point, 1.0mm, Assorted Ink, 3/Pack (1919997)~#|#~C46B67B6-1EEE-4A0E-87815F4CC01EC5F3_sc7
uniball Signo Gel Impact Pens, Bold Point, 1.0mm, Assorted Ink, 3/Pack (1919997) is New at Staples
Item: UBC1919997
Model: UBC1919997
Price is $12.62
Unit of measure 3/Pack
Delivery by Wed, May 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Pilot VBall RT Retractable Rollerball Pens, Extra Fine Point, Black Ink, Dozen (26106)~#|#~sp162572962_sc7Pilot VBall RT Retractable Rollerball Pens, Extra Fine Point, Black Ink, Dozen (26106)~#|#~sp162570269_sc7
Item: PIL26106
Model: PIL26106
Price is $31.99
Unit of measure Dozen
Delivery by Wed, May 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
uniball Zento Retractable Gel Pen, Medium Point, 0.7mm, Black Ink, Dozen (70660)~#|#~sp257579750_sc7uniball Zento Retractable Gel Pen, Medium Point, 0.7mm, Black Ink, Dozen (70660)~#|#~sp257579749_sc7
uniball Zento Retractable Gel Pen, Medium Point, 0.7mm, Black Ink, Dozen (70660) is New at Staples
Item: UBC70660
Model: UBC70660
Price is $22.39
Unit of measure Dozen
Next-Day Delivery by tomorrow
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Zebra Z-Grip Retractable Ballpoint Pen, Medium Point, 1.0mm, Black Ink, 48 Pack (22148)~#|#~A3267B23-8E1A-4E08-AD2CC48422B3FCD2_sc7Zebra Z-Grip Retractable Ballpoint Pen, Medium Point, 1.0mm, Black Ink, 48 Pack (22148)~#|#~AD63EE8B-99A2-4449-A0AF034638AA51CD_sc7
Item: ZEB22148
Model: ZEB22148
Price is $27.99
Unit of measure Pack
Delivery by Thu, May 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
uniball Zento Retractable Gel Pen, Medium Point, 0.7mm, Black Ink, Dozen (70663)~#|#~sp257579776_sc7uniball Zento Retractable Gel Pen, Medium Point, 0.7mm, Black Ink, Dozen (70663)~#|#~sp257579775_sc7
uniball Zento Retractable Gel Pen, Medium Point, 0.7mm, Black Ink, Dozen (70663) is New at Staples
Item: UBC70663
Model: UBC70663
Price is $36.59
Unit of measure Dozen
Free delivery by Thu, May 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Paper Mate Profile Retractable Gel Pen, Bold Point, Black Ink, Dozen (2095465)~#|#~sp93779941_sc7Paper Mate Profile Retractable Gel Pen, Bold Point, Black Ink, Dozen (2095465)~#|#~sp78990974_sc7
Paper Mate Profile Retractable Gel Pen, Bold Point, Black Ink, Dozen (2095465) is New at Staples
Item: PAP2095465
Model: PAP2095465
Price is $26.19
Unit of measure Dozen
Delivery by Wed, May 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
uniball 207 Plus+ Retractable Gel Pen, Micro Point, 0.5mm, Black Ink, Dozen (70606)~#|#~sp257579836_sc7uniball 207 Plus+ Retractable Gel Pen, Micro Point, 0.5mm, Black Ink, Dozen (70606)~#|#~sp257579835_sc7
uniball 207 Plus+ Retractable Gel Pen, Micro Point, 0.5mm, Black Ink, Dozen (70606) is New at Staples
Item: UBC70606
Model: UBC70606
No reviews yet
Price is $22.49
Unit of measure Dozen
Delivery by Thu, May 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Pentel EnerGel RTX Deluxe Retractable Gel Pen, Medium Point, 0.7mm, Blue Ink (PENBLN77C)~#|#~s0265066_sc7
Pentel EnerGel RTX Deluxe Retractable Gel Pen, Medium Point, 0.7mm, Blue Ink (PENBLN77C) is New at Staples
Item: PENBLN77C
Model: PENBLN77C
Price is $6.39
Delivery by Wed, May 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
AbilityOne SKILCRAFT Zebra Fine Point Retractable Gel Pen, Black Gel, based Ink, Clear, Black Barrel, 12/DZ (NSN6471706)~#|#~m003436234_sc7
AbilityOne SKILCRAFT Zebra Fine Point Retractable Gel Pen, Black Gel, based Ink, Clear, Black Barrel, 12/DZ (NSN6471706) is New at Staples
Item: NSN6471706
Model: NSN6471706
No reviews yet
Price is $23.41
Unit of measure Dozen
Delivery by Thu, May 21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Pentel EnerGel RTX Deluxe Retractable Liquid Gel Pens, Medium Point, Black Ink (PENBLN77A)~#|#~s0823758_sc7Pentel EnerGel RTX Deluxe Retractable Liquid Gel Pens, Medium Point, Black Ink (PENBLN77A)~#|#~s0143123_sc7
Pentel EnerGel RTX Deluxe Retractable Liquid Gel Pens, Medium Point, Black Ink (PENBLN77A) is New at Staples
Item: PENBLN77A
Model: PENBLN77A
Price is $8.49
Delivery by Wed, May 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Pentel EnerGel Retractable Gel Pen, 0.7mm, Medium Point, Pink Ink (PENBL77PWP)~#|#~s0640844_sc7Pentel EnerGel Retractable Gel Pen, 0.7mm, Medium Point, Pink Ink (PENBL77PWP)~#|#~m000071348_sc7
Pentel EnerGel Retractable Gel Pen, 0.7mm, Medium Point, Pink Ink (PENBL77PWP) is New at Staples
Item: PENBL77PWP
Model: PENBL77PWP
Price is $6.19
Delivery by Wed, May 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Pilot EasyTouch Pro Retractable Ballpoint Pen, Medium Point, Blue Ink, Dozen (PIL31911)~#|#~s0804349_sc7
Pilot EasyTouch Pro Retractable Ballpoint Pen, Medium Point, Blue Ink, Dozen (PIL31911) is New at Staples
Item: PIL31911
Model: PIL31911
Price is $24.99
Unit of measure Dozen
Delivery by Wed, May 20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Lamy Safari Retractable Ballpoint Pen, Medium Point, Black Ink (L217BC)~#|#~sp160879260_sc7
Item: 24518870
Model: L217BC
Price is $21.49
Price per unit $21.49/Pen
Next-Day Delivery by tomorrow
30-min pickup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Staples Aura Retractable Ballpoint Pens, Medium Point, Black Ink, Dozen (29091)~#|#~sp45378780_sc7Staples Aura Retractable Ballpoint Pens, Medium Point, Black Ink, Dozen (29091)~#|#~sp45378779_sc7
Staples Aura Retractable Ballpoint Pens, Medium Point, Black Ink, Dozen (29091) is In-store only
Item: 2072156
Model: 29091
Price is $10.49
Unit of measure Dozen Price per unit $0.87/Pen
See alternate delivery items
30-min pickup
Lamy Vista Retractable Ballpoint Pen, Medium Point, Black Ink (L212BC)~#|#~sp160879262_sc7
Item: 24518873
Model: L212BC
Price is $21.49
Price per unit $21.49/Pen
Next-Day Delivery by tomorrow
30-min pickup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
Zebra 301A Retractable Ballpoint Pen, Fine Point, Black Ink, 2/Pack (27502)~#|#~sp56876740_sc7
Zebra 301A Retractable Ballpoint Pen, Fine Point, Black Ink, 2/Pack (27502) is In-store only
Item: 324765
Model: 27502
Price is $10.99
Unit of measure 2/Pack Price per unit $5.50/Pen
See alternate delivery items
30-min pickup
uni-ball 207 Retractable Gel Pen, Super Fine Point, 0.38mm, Black Ink, 5/Pack (1960301)~#|#~7AAC1A79-7B30-45A9-9A4DDC625F98B4A8_sc7uni-ball 207 Retractable Gel Pen, Super Fine Point, 0.38mm, Black Ink, 5/Pack (1960301)~#|#~94CA21B1-16BB-4984-94B922FDF8066AAC_sc7
uni-ball 207 Retractable Gel Pen, Super Fine Point, 0.38mm, Black Ink, 5/Pack (1960301) is In-store only
Item: 1833249
Model: 1960301
Price is $11.99
Price per unit $2.40/Pen
See alternate delivery items
30-min pickup
Sharpie S-Gel Retractable Gel Pens, Bold Point, 1.0mm, Blue Ink, 36 Pens/Pack (2096127)~#|#~476D5EA7-72FE-47D5-B6D76185D8B30970_sc7Sharpie S-Gel Retractable Gel Pens, Bold Point, 1.0mm, Blue Ink, 36 Pens/Pack (2096127)~#|#~22B99310-96EE-4C62-B386F4D6733607AA_sc7
Sharpie S-Gel Retractable Gel Pens, Bold Point, 1.0mm, Blue Ink, 36 Pens/Pack (2096127) is Out of stock
Item: 24692265
Model: 2096127
Price is $52.99
Unit of measure 36/Pack
Pilot G2 SmileyWorld Retractable Gel Pens, Fine Point, 0.7mm, Assorted Ink, 8/Pack (G2HC8003FPST)~#|#~3673535B-5F59-488B-998046F1AE84F128_sc7Pilot G2 SmileyWorld Retractable Gel Pens, Fine Point, 0.7mm, Assorted Ink, 8/Pack (G2HC8003FPST)~#|#~15E0F3A3-C446-4A08-B3C092C330A315FC_sc7
Pilot G2 SmileyWorld Retractable Gel Pens, Fine Point, 0.7mm, Assorted Ink, 8/Pack (G2HC8003FPST) is Out of stock
Item: 24686586
Model: G2HC8003FPST
No reviews yet
Price is $13.99
Unit of measure 8/Pack
Pilot G2 Boost Retractable Gel Pens, Fine Point, 0.7mm, Assorted Ink, 36/Pack (G2736001-TBST)~#|#~5A0A6D29-1328-49C6-BE835CD206AE1330_sc7
Pilot G2 Boost Retractable Gel Pens, Fine Point, 0.7mm, Assorted Ink, 36/Pack (G2736001-TBST) is Out of stock
Item: 24686588
Model: G2736001-TBST
No reviews yet
Price is $48.99
Unit of measure 36/Pack
Paper Mate InkJoy Retractable Ballpoint Pens, Medium Point, Assorted Ink, 16/Pack (1952706)~#|#~DD6893F9-C638-4FF1-8A6885C8F66205CA_sc7Paper Mate InkJoy Retractable Ballpoint Pens, Medium Point, Assorted Ink, 16/Pack (1952706)~#|#~8973AFDE-E251-4A5F-8796ADFEA5C01E01_sc7
Paper Mate InkJoy Retractable Ballpoint Pens, Medium Point, Assorted Ink, 16/Pack (1952706) is Out of stock
Item: 24692310
Model: 1952706
Price is $9.29
Unit of measure 16/Pack
Sharpie S-Gel Retractable Gel Pens, Medium Point, 0.7mm, Black Ink, 22 Pens/Pack (2153949)~#|#~9C2D0ED0-CAA5-40C1-A53E36813F90C43C_sc7Sharpie S-Gel Retractable Gel Pens, Medium Point, 0.7mm, Black Ink, 22 Pens/Pack (2153949)~#|#~3B6DB5C1-B3EF-4A96-ADDEDC2EB02681DE_sc7
Sharpie S-Gel Retractable Gel Pens, Medium Point, 0.7mm, Black Ink, 22 Pens/Pack (2153949) is Out of stock
Item: 24692322
Model: 2153949
Price is $33.49
Unit of measure 22/Pack
Paper Mate InkJoy Retractable Ballpoint Pens, Medium Point, Black Ink, 16/Pack (1952705)~#|#~019FB866-E48A-4B8A-8656AA6362C37C4D_sc7Paper Mate InkJoy Retractable Ballpoint Pens, Medium Point, Black Ink, 16/Pack (1952705)~#|#~3BAEAA44-A803-4226-9510FB8B07BB1953_sc7
Paper Mate InkJoy Retractable Ballpoint Pens, Medium Point, Black Ink, 16/Pack (1952705) is Out of stock
Item: 24692309
Model: 1952705
Price is $9.29
Unit of measure 16/Pack
Sharpie S-Gel Retractable Gel Pens, Bold Point, 1.0mm, Black Ink, 36 Pens/Pack (2096181)~#|#~7651490C-D5AF-4DA1-8F51C77658672398_sc7Sharpie S-Gel Retractable Gel Pens, Bold Point, 1.0mm, Black Ink, 36 Pens/Pack (2096181)~#|#~38AD4957-5CDA-419E-B3E68351A086A177_sc7
Sharpie S-Gel Retractable Gel Pens, Bold Point, 1.0mm, Black Ink, 36 Pens/Pack (2096181) is Out of stock
Item: 24692264
Model: 2096181
Price is $52.99
Unit of measure 36/Pack
Pentel EnerGel Pro Retractable Gel Pen, Medium Point, Blue Ink, 3/Pack (BLP77BP3C)~#|#~sp62140331_sc7
Pentel EnerGel Pro Retractable Gel Pen, Medium Point, Blue Ink, 3/Pack (BLP77BP3C) is Out of stock
Item: PENBLP77BP3C
Model: PENBLP77BP3C
No reviews yet
Price is $9.70
Unit of measure Pack
Pilot EasyTouch Pro Retractable Ballpoint Pen, Medium Point, Black Ink, Dozen (PIL31910)~#|#~s0804348_sc7
Pilot EasyTouch Pro Retractable Ballpoint Pen, Medium Point, Black Ink, Dozen (PIL31910) is Out of stock
Item: PIL31910
Model: PIL31910
No reviews yet
Price is $24.99
Unit of measure Dozen
Pilot BP1-RT Retractable Ballpoint Pens, Medium Point, 1.0mm, Red Ink, Dozen (BPR--REDM)~#|#~BB9C66C0-5A71-4CBF-A4F835D8BEFAD718_sc7Pilot BP1-RT Retractable Ballpoint Pens, Medium Point, 1.0mm, Red Ink, Dozen (BPR--REDM)~#|#~2B3988D2-935B-48CB-85EF385843F8F7DE_sc7
Pilot BP1-RT Retractable Ballpoint Pens, Medium Point, 1.0mm, Red Ink, Dozen (BPR--REDM) is Out of stock
Item: 24686585
Model: BPR--REDM
No reviews yet
Price is $9.99
Unit of measure Dozen
Pentel RSVP Super RT Ballpoint Pen, Medium Point, Assorted Ink, 8/Pack (BX480BP8M)~#|#~m006987126_sc7
Pentel RSVP Super RT Ballpoint Pen, Medium Point, Assorted Ink, 8/Pack (BX480BP8M) is Out of stock
Item: PENBX480BP8M
Model: PENBX480BP8M
No reviews yet
Price is $27.89
Unit of measure Pack
Paper Mate InkJoy Retractable Gel Pens, Medium Point, 0.7mm, Black Ink, 6/Pack (1951728)~#|#~sp309755336_sc7Paper Mate InkJoy Retractable Gel Pens, Medium Point, 0.7mm, Black Ink, 6/Pack (1951728)~#|#~sp309755335_sc7
Paper Mate InkJoy Retractable Gel Pens, Medium Point, 0.7mm, Black Ink, 6/Pack (1951728) is Out of stock
Item: 24692332
Model: 1951728
Price is $11.69
Unit of measure 6/Pack
Paper Mate Profile Retractable Ballpoint Pen, Medium Point, Red Ink, Dozen (2095454)~#|#~7D26F659-AF60-45E4-B32DBB92009B8A09_sc7Paper Mate Profile Retractable Ballpoint Pen, Medium Point, Red Ink, Dozen (2095454)~#|#~859E8FA2-BBAE-4268-A57B50C359AE9DF2_sc7
Paper Mate Profile Retractable Ballpoint Pen, Medium Point, Red Ink, Dozen (2095454) is Out of stock
Item: PAP2095454
Model: PAP2095454
Price is $35.79
Unit of measure Dozen
Sharpie S-Gel Retractable Gel Pen, Medium Point, 0.7 mm, Blue Ink, 12/Pack (SAN2147525)~#|#~64A51189-DC61-46BF-B509A0E64983DD59_sc7Sharpie S-Gel Retractable Gel Pen, Medium Point, 0.7 mm, Blue Ink, 12/Pack (SAN2147525)~#|#~5D76B0F2-DC48-4229-9A1662953C0DA5A1_sc7
Sharpie S-Gel Retractable Gel Pen, Medium Point, 0.7 mm, Blue Ink, 12/Pack (SAN2147525) is Out of stock
Item: SAN2147525
Model: SAN2147525
Price is $78.89
Unit of measure Dozen
Paper Mate ComfortMate Ultra Retractable Ballpoint Pen, Medium Point, Black Ink, Dozen (6330187)~#|#~sp48967399_sc7Paper Mate ComfortMate Ultra Retractable Ballpoint Pen, Medium Point, Black Ink, Dozen (6330187)~#|#~sp114502039_sc7
Paper Mate ComfortMate Ultra Retractable Ballpoint Pen, Medium Point, Black Ink, Dozen (6330187) is Out of stock
Item: PAP6330187
Model: PAP6330187
Price is $12.99
Unit of measure Dozen
Paper Mate ComfortMate Ultra Retractable Ballpoint Pen, Medium Point, Red Ink, Dozen (6320187)~#|#~sp41817258_sc7Paper Mate ComfortMate Ultra Retractable Ballpoint Pen, Medium Point, Red Ink, Dozen (6320187)~#|#~s1201230_sc7
Paper Mate ComfortMate Ultra Retractable Ballpoint Pen, Medium Point, Red Ink, Dozen (6320187) is Out of stock
Item: PAP6320187
Model: PAP6320187
Price is $12.99
Unit of measure Dozen
Paper Mate InkJoy 100 RT Retractable Ballpoint Pen, Black Ink, 25/Pack (2106958)~#|#~DD0B4A43-C062-435B-BA2EF302C97C4C96_sc7Paper Mate InkJoy 100 RT Retractable Ballpoint Pen, Black Ink, 25/Pack (2106958)~#|#~sp129901684_sc7
Paper Mate InkJoy 100 RT Retractable Ballpoint Pen, Black Ink, 25/Pack (2106958) is Out of stock
Item: PAP1951395
Model: PAP1951395
Price is $9.99
Unit of measure 20/Pack
TRU RED™ Retractable Quick Dry Gel Pens, Medium Point, 0.7mm, Black, 5/Pack (TR54494)~#|#~CEFC0454-A0F1-44EE-835F1D63EF1481FA_sc7TRU RED™ Retractable Quick Dry Gel Pens, Medium Point, 0.7mm, Black, 5/Pack (TR54494)~#|#~8301909C-55FE-4C5A-872C2761BE971C1A_sc7
TRU RED™ Retractable Quick Dry Gel Pens, Medium Point, 0.7mm, Black, 5/Pack (TR54494) is Out of stock
Item: 24377035
Model: TR54494M-CC
Price is $4.99
Unit of measure 5/Pack Price per unit $1.00/Pen
TRU RED™ Retractable Quick Dry Gel Pens, Medium Point, 0.7mm, Blue, Dozen (TR54499-CC)~#|#~A2E07E78-4AF9-4F84-9CEE25B43F333460_sc7TRU RED™ Retractable Quick Dry Gel Pens, Medium Point, 0.7mm, Blue, Dozen (TR54499-CC)~#|#~8F24FF03-A6F6-4E4B-954172B7433C9A28_sc7
TRU RED™ Retractable Quick Dry Gel Pens, Medium Point, 0.7mm, Blue, Dozen (TR54499-CC) is Out of stock
Item: 24377029
Model: TR54499M-CC
Price is $10.99
Unit of measure Dozen Price per unit $0.92/Pen