OEM Quality Park Survivor First Class Envelopes, packaged with 100 envelopes per box. These open-end catalog envelopes feature a patented release strip for easy opening and a convenient Flap-Stik closure that requires no moisture to seal. Made from DuPont Tyvek, these envelopes are designed to be stronger and more secure than traditional paper envelopes, resisting rips, tears, and punctures. Lightweight and water-resistant, they help save on postage costs while ensuring your documents are protected.