Adjustable Long Plastic X Seal The Acme X Seal is a versatile smooth ribbon plastic pull-tight seal manufactured from Polypropylene material. Product Specifics I manufactured from Polypropylene material MATERIAL: Body – Polypropylene with Biodegradable additives/Insert – Acetyl with Biodegradable additives Airlines, Cargo, Trailers, Containers, Rail freight, Refineries, Warehouses, Cash bags, Postbags, Lockers Back