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These Tyvek&#174; envelopes provide superior puncture, tear and moisture protection. Features:<ul style="margin-top:0px;padding-top: 5px: padding-bottom: 5px;"><li>Constructed from 14 lbs olefin</li><li>Ten times stronger than paper envelopes</li><li>Features self-seal closure</li><li>Available in plain and first class printed borders</li></ul>

Tyvek&#174; Self Seal Flat Envelopes, 13&quot;W x 19&quot;L, White, 100/Pack

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