... :silicon carbide 5.durable Made of silicon carbide, epoxy resin and nylon 66 .they are durable to performing excellently with clear ... effect. They are mainly used on different metal surface finish and non-metal substance, such as wood, plastic, glass, stone, ... raket of gulf; copper wares, aluminium ware, plating copper and bronze, etc; woodenware, plastic wares, marble, etc…Feature:No blockage under ...