Tyvek® FLAT ENVELOPES Open End, Green First Class Border, Zip Stick 500/Carton Flaps Folded Tyvek SUB 14Tyvek envelopes printed with the classic first class border tell your recipient the contents are very important. They come with an easy to use Zip Stick seal flap. No moisture needed to close tight. Made with strong, lightweight, and durable, SUB 14 Tyvek.Tyvek Envelope Terms"SUB 14" refers to the substrate weight. Tyvek envelopes come in SUB 11, SUB 14, and SUB 18. We carry all three."Catalog" or "open end" designates the opening to be on the short dimension of the envelope. "Booklet" or "open side" designates opening on the long dimension."Zip Stick" or "Peal & Seal" refers to a self seal closure.First Class Border Tyvek Envelope SpecificationsSize: 10 X 15Style: CatalogMaterial: Tyvek SUB 14Features: green first class border, self seal closureQuantity: 500 envelopes per cartonMPN: 1210FCPrice: $204.38 per cartonDiscount: Multiple carton discountsShipping: Free FedEx Ground to Continental USANot sure this is what you need? Ask for a free 10 X 15 Tyvek Envelope Today.Check out my other items!We are very easy to work with and gaurantee your satisfaction.