Art. No.: 300053925 Product Name: DF-03Ra Slipper Clutch Set. Optional part for Dark Impact (DF-03). The slipper clutch is an essential component for racing buggies. The specially designed slipper clutch protects the drive shaft, clutch, and motor of your RC car from the stresses of off-road running and jumping. Includes a new 82T spur gear that can be combined with the R/C 05 pinions from items 53922 and 53923 to expand the options for gear ratios.