Get the most protective envelope for your business and be confident when sending important papers and items. JAM Paper White Tyvek Heavy Duty Booklet Style Envelopes are the best way to confidently send all your invoices, cash, checks, and other sensitive documents. The straight flap and self adhesive strip makes it quick and efficient to send out multiple envelopes with ease. Each 9" x 12" envelope is partially made from DuPont's super strong polymer, making them more water- and tear-resistant than a regular paper envelope. The semi-smooth polymer envelope comes in a bulk pack of 500 envelopes. Now you can get the all of your mailing done in one stop and not having to worry about reordering extras. Tyvek is a registered trademark of DuPont, an established chemical company that develops the powerful polymer used to make these envelopes. At JAM we love paper but we also love the environment, which is why our White Tyvek Envelopes are made with 10% recycled sustainable materials. Make the eco friendly transition with your business! Details:White9" x 12"Straight flapSelf-adhesive strip500 envelopesTyvek, polymer, and 10% recycled materials