Each one has a straight flap with a reliable gum closure to keep items secure in storage and transport This pack contains 50 envelopes. Each one features a flat black color that gives them a sophisticated and refined appearance. The small size of these envelopes makes them ideal for cash, checks, coins, small trinkets, note cards, business cards, tickets, memos, mementos, and more. Use these envelopes in your office or home for any small item storage or mailing purpose. Details:Black3.13" x 5.5" (#5.5)28 lb.50 envelopes 30% recycled paper