Poly Mailers, Material Poly, Mailer Type Bubble, Closure Style Self Sealing, Color White, Usable WxL 9 3/8 in x 13 1/4 in, Usable Width 9 3/8 in, Usable Length 13 1/4 in, Outside WxL 9 1/2 in x 14 1/2 in, Outside Width 9 1/2 in, Outside Length 14 1/2 in, Mailer Number #4, Bubble Size 3/16 in, Material Thickness 0.188 in, With Tear Strip No, Pre-Printed Address Lines No, Package Quantity 100 Poly bubble mailers resist tearing and protect the contents from moisture and water. A self-sealing closure secures the contents in the envelope for shipment. The bubble liner protects items from damage during shipment.Bubble mailers have a plastic bubble liner to provide some cushioning and padding around items. These mailing envelopes protect the contents of the package and help prevent breakage durin.