The star coupling is created of polyurethane, which has the characteristics of cushioning, vibration reduction and abrasion resistance. It is simple to disassemble and assemble, and the working temperature is -20ºC~80ºC.The hub materials are powder metallurgy, forged iron, ball mill forged iron or steel and aluminum alloy.The elastomer is produced of polyurethane, CZPT in four diverse degrees of hardness (80A, 92A, 98A, 64D) and withstands distinct torques, of which 92A is regular.