Mailer Envelopes, Material Poyethylene, Metalized Polyethylene, Mailer Type Insulated, Closure Style Lip and Tape, Color Silver, Usable WxL 17 1/2 in x 21 3/4 in, Usable Width 17 1/2 in, Usable Length 21 3/4 in, Outside WxL 18 in x 22 in, Outside Width 18 in, Outside Length 22 in, Bubble Size 3/16 in, Material Thickness 0.003 in, Post-Consumer Recyclability 0 Percent, With Tear Strip No, Pre-Printed Address Lines No, Standards Compliant Materials, Package Quantity 50