JAM Paper Tyvek Envelopes, #11, 4 1/2 x 10 3/8, White, 250 Pack high_school|en_CA your contents stay colorful and

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JAM Paper Tyvek Envelopes, #11, 4 1/2 x 10 3/8, White, 250 Pack high_school|en_CA your contents stay colorful andJAM Paper Heavy Duty Tyvek Envelopes are some of the strongest and sturdiest envelopes available. Tyvek is a registered trademark of DuPont, the established chemical company responsible for developing this durable polymer. Tyvek is composed of high density polyethylene fibers, a synthetic material that is extremely hard to rip and tear. This type of material is the same used to build and insulate houses, so you can be assured the materials inside

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