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JAM Paper Tyvek Envelopes, 10 x 13 Open End, White Airmail, 50 Pack home_audio_theatre_l3_audio_tv_video_games_l2_electronics_l1|fr_CA Scratch resistant polycarbonate lens providesJAM 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