Wilson Case uses only top quality raw materials and hardware to manufacture tough shipping cases that are able to be used again and again. Strict quality control guidelines are followed through out the production and inspection phases. Wilson LT Reinforced Tri-laminate - 100% recyclable Polyproplene with non-directional cellular center, 7mm, talc-filled. Thermoformed center layer is laminated to outer layer hermetically sealing air loaded cells. When third layer is laminated to the opposite side the resulting three dimensional sheet is stronger and lighter weight than laminated plywood or extruded polyethylene sheets.