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LUX A1 Invitation Envelopes (3 5/8 x 5 1/8) are perfect for Invitations, Weddings, Announcements, Photos, and so much more, sold as 1000 per box. The A1 (3 5/8 x 5 1/8) in 80lb. Blush is a soft pink color with a hint of peach. Perfect for RSVP cards, upscale invitations, announcements, and notes. The A1 is easily sealed by a Peel & Press strip located on the back square flap and constructed with two side seams. For social and invitation purposes, the A1 is also a great reply envelope as it easily fits inside A2, A4, A6, A7, A8, A9 and A10 size envelopes. The 80lb. LUX Blush Paper is smooth and sophisticated, designed to complement your stylish event. Available both plain and printed for customization, branding and creative uses, starting in small quantities of 50 to large quantities of 50,000 and more.