JAM Paper® Parchment Blue Recycled #10 Business Envelopes measure 4 1/8 x 9 1/2 inches in size and are made out of smooth, 24lb, 30% recycled paper! This pack contains a total of 25 envelopes. Each envelope in this set features a light blue marbled color that will give your mail a beautiful and calming appearance. These business envelopes are the perfect size for standard sized sheets of paper folded into thirds. To keep the items placed within them secure as they are transported from place to place through the mail, these envelopes feature straight flap openings and reliable, moisture activated gum closures. Use them for home and office mailing purposes.