OEM Quality Park open-end catalog 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 resist ripping, tearing, and puncturing, making them stronger and more secure than traditional paper envelopes. Additionally, they are water-resistant and moisture-resistant, lightweight to help save on postage costs, and easy to use with a simple peel and seal mechanism.