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The star coupling is made of polyurethane, which has the characteristics of cushioning, vibration reduction and abrasion resistance. It is easy to disassemble and assemble, and the working temperature is -20ºC~80ºC.The hub materials are powder metallurgy, cast iron, ball mill cast iron or steel and aluminum alloy.The elastomer is made of polyurethane, available in 4 different degrees of hardness (80A, 92A, 98A, 64D) and withstands different torques, of which 92A is standard.