This propeller shaft set uses a universal joint to connect the front and rear gearbox instead of the kit standard &ldquodog-bone&rdquo style connection. The universal type connection offers smoother transfer of power thereby increasing the efficiency of the TB-05 drivetrain.  - 90mm Aluminum Propeller Shaft (rear) x1  - 42mm Aluminum Propeller Shaft (front) x1  - Cross joints, input shafts and other small parts included.  - These parts replace kit standard propeller shafts and pilot shafts.  - Newly-designed universal joint propeller shafts will give smooth, efficient power.