OEM Quality Park open-end envelopes, sold in a box of 100. These envelopes feature a patented release strip for easy opening and a convenient Flap-Stik closure that does not require moisture to seal. Made from DuPont Tyvek, they are designed to be stronger and more secure than traditional paper envelopes, resisting rips, tears, and punctures. Lightweight and water-resistant, these envelopes help save on postage costs while providing reliable protection for your documents.