Quality Park, Catalog Envelope, Redi-Strip, First Class Border, White, 10x13, 100 per box (44786) DURABLE: Heavyweight 28-lb. paper stock ensures no rips or tears REDUCE WASTE: Not only will the Redi-Strip save your time, it will save your money! These envelopes have a longer shelf life thanks to the peelable strip that protects your adhesive from dust! FEATURES: 100, 10X13 First Class Border Catalog Envelopes FIRST CLASS MAIL LOGO: Say goodbye to delayed deliveries with this Tyvek Envelope with a First Class Mail Logo! SECURE: Redi-Strip seak-adhesive closure will ensure your contents stay safe with the licking factor out of mind