JAM Paper #10 White Business Tyvek Envelopes can be filled up with items without ripping apart at the seams! They're made from heavy-duty Tyvek material, which is tear-proof, and 10% recycled content. Your letters, billing statements, receipts and other mail will be protected and secure inside these unique envelopes that measure 4 1/8" x 9 1/2". They can be stored at home, work, school and a variety of other places. Each one has a smooth texture and commercial gummed flap, which securely seals and prevents your contents from falling out. This pack of 25 booklet-style envelopes will be a great addition to any stationery collection!Details:White4.125" x 9.5"Tear-proofCommercial gummed flapBooklet opening25 envelopes10% recycled Tyvek polymer