Made by Xtarps these truck Xtarps lumber tarps machinery tarps steel tarps coil tarps flat smoke tarps are made from light weight 15 OZ gauge (15 oz per square yard) vinyl fabric. It is medium duty compared with heavy duty 18 OZ gauge material but still strong enough to meet most of the trucking needs. Our Xtarps series truck tarps are designed for tough trucking business use. All seams are heat sealed to ensure its waterproof. Tarps are used to secure and cover machines steel rods steel cables steel sheet plywood etc. during transpiration by flatbed truck.