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 durable DuPont Tyvek, they are resistant to ripping, tearing, and puncturing, offering superior strength compared to traditional paper envelopes. Additionally, they are water-resistant and moisture-resistant, lightweight for cost-effective postage, and easy to use with a simple peel and seal mechanism.