Whether you're sending documents, coins, or other small items, JAM Paper White Tyvek Peel and Seal Envelopes are the best option. These envelopes have a straight flap and a self-seal adhesive strip that helps lock in and protect all your envelope's contents. The white semi-smooth finish and polymer material help make this envelope more tear and water resistant than regular paper envelopes. This pack includes 500 premium envelopes, the perfect amount for large and small business to operate properly. These 10" x 13" envelopes are also great for storing small items and papers for a long period of time. 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:White10" x 13"Straight flapSelf-adhesive seal500 envelopesTyvek, polymer, and 10% recycled materials