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TYF1013TE - 10 x 13. Tamper Evident Tyvek Envelopes are made from a 14 lb. olefin, resulting in strength ten times that of a standard paper envelope. Featuring a seal that, when broken, reveals the word "OPENED" in red on the flap. Use these Tamper Evident Tyvek Envelopes to protect important documents.
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