JAM Paper #11 White Tyvek Tear-Proof Envelopes aren't your typical white business envelopes! They won't rip at the seams from the slightest strain. That's because these are produced from heavy-duty Tyvek material, which is sturdy and durable. They're difficult to tear or damage. So mail your letters, documents, checks, photos, receipts or other mail using these 4 1/2" x 10 3/8" envelopes. They guarantee your items protection. Each one is composed of 10% post-consumer content. It also features a smooth finish and a commercial flap with gum closure, which firmly encloses the envelope. This pack contains 25 booklet envelopes, a great supply that will serve you well!Details:White4.5" x 10.375"Tear-proofCommercial flapGum closure25 envelopes10% recycled Tyvek polymer