... nylon canvas as a skeleton, two cloth three glue, monolayer thickness of 10 mm L×W= ... Pad,PlateQB-2Plate adopted mould manufacturing, material of cast steel, galvanized, anticorrosive processing. The pad ... different functionsStrength canvas The outer layer is made of the special rubber material characterized by wear, ... The inner layer is used for protection of canvas and it is characterized by watertight ...