Envelopes with clasp closures have a sleek and professional look, and reliable functionality, that makes them great for any home or office document mailing need! These envelopes are made out of smooth, high quality, 28lb paper. To keep enclosed items secure, each one features a straight flap and a dependable, easy-to-use metal claps closure in addition to an optional gum closure for added reinforcement. Details:Smooth black9" x 12" envelope size28 lb.Straight flap with metal clasp closure and optional gum closureAvailable in multiple countsPaper and metal