Material: Kraft film with bubbles, 100% recyclable. Sealing Flap: 4cm. √ Tight Seal and Safety. #2 23×28+4cm 8½ ” x 12″ 8½ ” x 11″. #1 19×28+4cm 7¼ ” x 12″ 7¼ ” x 11″. #0 18×23+4cm 6 ” x 10″ 6 ” x 9″.