Survivor® 9 x 12 DuPont Tyvek First Class Border Mailers with Self-Seal Closure - First Class Mail - #10 1/2 - 9" Width x 12" Length - 14 lb - Peel & Seal - Tyvek - 100 / Box - White

Patented release strip makes these open-end catalog envelopes easy to open. Convenient Flap-Stik closure does not require moisture to seal. First-class envelopes made of DuPont Tyvek won't rip, tear or puncture. They are much stronger and more secure than traditional paper envelopes. Water-resistant and moisture-resistant envelopes are lightweight to save on postage costs. Envelopes are easy to use. Simply peel and seal.