Poly Mailer size #1 (6x9) QTY: 100 Made with100% NEWpolyethylene material. Use top quality PDG (Permanent Destroy Glue) for seal. Once the seal is closed, envelope cannot reopen after 5 sec. Dark Gray opaque inner layer to protect the privacy of the package contents. Ultra light weight, save on postage Matt surface accepts pen, marker, stamps, and label Made with triple layer polyethylene film Moisture and puncture-resistant; excellent tear strength. Machine proof by US Postal Surface. It won't jam their auto sorting machine. Self-adhesive, tamper-evident closure with poly-release liner easy-to-use; secure closure
