Quality Park R1462 Tyvek Open-End Envelope, Plain, 9'' x 12'', 50/BX, White, QUAR1462, QUA R1462, Patented release strip makes these open-end catalog envelopes easy to open. Convenient Flap-Stik closure does not require moisture to seal. Envelopes are 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. UPC Code 047614114624, Quantity 50/BX