9×12 Tyvek Envelopes – Strong Lightweight Professional Shipping Mailer Tear Resistant DuPont™ Tyvek® Construction & Easy Security Self Seal Closure –Bright White DuPont – Bulk Pack of 15 – 9 x 12 inch ✓ Free 60 Day Returns ✓ Free Express Shipping Description: Features: HEAVY DUTY ENVELOPES Classic White Mailers Are Perfect for Sending Documents, Invoices, Checks & Other Office Correspondence; Box of 15 Sheets.INDESTRUCTIBLE DUPONT DESIGN Lightweight But Strong, Durable Tyvek Material Resists Ripping, Tearing, Punctures, Rain, Moisture & Other Common Postal Threats.CONVENIENT SELF SEAL CLOSURE Peel Back the Sticker to Quickly & Effortlessly Seal & Send; Open End Catalog Orientation Enables Fast Paper & Packet Stuffing.SUPERIOR SHIPPING PROTECTION Double Reinforced Construction, Opaque Color & Super Sticky Glue Offers Maximum Security for Confidential Business Mail.BUY CHECKOMATIC & SAVE BIG Stock Up on Bulk Supplies & Enjoy the Best Prices in the Industry; Envelope Packs Available in 6×9, 9×12, 10×13, 10×15 & 12 x 15 1/5 . Product Details: Brand: EnDocColor: whiteClosure Type: Self-SealMaterial: PaperNumber of Items: 15Manufacturer: EnDocBrand: EnDocItem Weight: 7 ouncesProduct Dimensions: 12 x 9 x 0.04 inchesIs Discontinued By Manufacturer: NoColor: whiteClosure: Self-SealShape: RectangularMaterial Type: PaperNumber of Items: 15Size: 9X12Manufacturer Part Number: En10Date First Available: May 23, 2018