9 1/2 X 12 1/2 Tyvek Envelopes - SUB 11 - Self Seal Zip Stick Closure White Tyvek Envelopes come with an easy to use self seal adhesive closure. No Moisture is needed to close the flap. Tyvek envelopes are more than 10 times stonger than normal paper envelopes.Normal use of this itemis a great way for you to distinquish your company from a marketing perspective. We can imprint your custom information up to 4 colors on all stock items.SUB 11 refers to the paper weight.11# is the lightest madeCatalog (open-end) designates the opening of an envelope on the short side dimension.All of our products are made in the United States of America.Tyvek Envelope SpecificationsPackaging: 500 envelopes per cartonClosure: Peel and SealSize: 9 1/2" X 12 1/2" Discount: Multiple carton discounts. Shipping: Free Fedex Ground to Continental USANot sure? Ask for a free tyvek envelope sample today.Optional Services: Custom printing up to 4 colorsNeed a different size or style envelope?Click this button >Marketing idea:Have the EnvelopeSpot printyour company logo, web URL, and QR code on the outside of your 9 1/2" X 12 1/2" tyvekenvelopes. It will generate customer interest and loyalty. Ask for details today. Powered by eCRATER . List your items fast and easy and manage your active items.