Padded Envelopes Specifications: Size: 13*17CM,15*20CM,20*25CM,20*30CM,30*40CM,40*50CM (1inch=2.54CM) Package: 30pcs/bag Color: White , if you need other color please contact the customer service, tell us what color you want. Perfect for shipping a wide variety of items. Self Sealing bubble Mailers provide outstanding low cost shipping protection. Upgrade your company image and ship with confidence with these self-seal poly mailers. Maximize shipping success while reducing costs. These popular shipping bags are sturdily built with multi-layer blend of polyethylene film and unique air cellular layers and 360°strong air bubble interior for protection during transit. Shipping labels adhere securely to the poly cover so the incidence of lost packages is reduced.