High-quality PolaFlex propeller bushes are rubber, not plastic, for gear shifting, less vibration, and better impact deflection. They don't use aluminum as cheaper brands do; instead, they have brass...
A high-quality propeller bush made of rubber to help with softer shifting into gear, less vibration, and better impact deflection is the Polastorm Polaflex Hub Kit. They don't have aluminum splines...
