With a diesel engine as the prime mover, a highly flexible coupling is often required for shifting resonances and damping of torsional vibration. This coupling protects the cardan shaft and the driven machinery from inadmissible vibratory loads. Our highly flexible couplings have been specifically developed for application in conjunction with cardan shafts. The main components of our coupling are the highly flexible element and the inner and outer coupling parts supported against each other. The elements have a high torsional flexibility and good damping properties.