Each one is made out of smooth recycled, high quality paper and has a straight flap with a reliable gum closure. The colors included in this pack are red, blue, green, orange, purple, and black. The size of these open end coin envelopes makes them ideal for receipts, checks, cash, bookmark-style invitations and Save the Date cards, invoices, memos, tickets, small trinkets and objects, and more. These envelopes will add some personality and color to your office and mailing supplies. Details:Includes an assortment of colors3.5" x 6.5" (#7)24 lb.150 envelopes Smooth, 230% recycled, high quality paper