XL-type star-shaped resiliently flexible coupling element is plastic, suitable for connecting two coaxial drive shafts, having a two-axis compensation relative offset, cushioning, shock absorption, wear resistance, adapted to the case generally, transfer Torque 20-35000.NM, operating temperature -35- + 80 degrees Celsius and is interchangeable with German ROTEX couplings. Star flexible coupling elastic polyurethane plastic components, with a buffer, shock absorption, abrasion resistance, and easy disassembly, operating temperature -35 to +80 degrees. Interchangeable with West Germany ROTEX couplings. Polyurethane elastomer is limited by a male claw block can be avoided external deformation due to internal deformation and impact generated by the centrifugal force generated; detent large concave, so involute tooth surface pressure line on the small upper teeth even withstand overload teeth still will not wear or deformation.