Material:metalized foil+bubble Name:Black Paper Wrap Bubble Pack Kraft Envelope, Express Mailing Bag Size:Customized Size Printing:Accepted Thickness:2.5-4mm Color:gold, blue, red, purple, silver... Shape:envelope Lining:Bubble-t seal time:0.3-0.5 Second Packaging & Printing:Mailing Bags Feature:Shock Resistance