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 does not require moisture to seal. Made from DuPont Tyvek, they are stronger and more secure than traditional paper envelopes, resistant to ripping, tearing, and puncturing. Lightweight and water-resistant, these envelopes help save on postage costs while ensuring your documents are well-protected.