Poly Mailers, Material Poly, Closure Style Self Sealing, Color White, Usable WxL 6 in x 9 in, Usable Width 6 in, Usable Length 9 in, Outside WxL 6 in x 9 in, Outside Width 6 in, Outside Length 9 in, Material Thickness 0.003 in, With Tear Strip Yes, Pre-Printed Address Lines No, Package Quantity 1000 Tear-resistant poly mailers are flexible envelopes that cannot be easily torn open. They are water-resistant and protect the contents against moisture. These envelopes seal closed. They do not have a padded liner and are ideal for mailing clothing and other items that are not fragile.