500 PCS 7*10CM PE Bayonet Type Valve Bag/Packaging Plastic Bags Super strong sealing, moistureproof prevent extrusion, good quality\aseptic production line Product name: PE bayonet valve bag Specification: width 7 cm * 10 cm long Material: PE281 (food grade, non-toxic environmental protection) Seal with concave and convex clasp,A pinch can seal with the hand,Valve bag material is PE, soft, good toughness.