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 of DuPont Tyvek, these envelopes are stronger and more secure than traditional paper options, offering resistance to ripping, tearing, and puncturing. Lightweight and moisture-resistant, they help save on postage costs while ensuring your documents are well-protected.