This MIP Spline CVD Kit is used on the Traxxas 1/10 Summit model. The MIP Spline CVD Kit replaces plastic drive shafts with Hardened High Strength Alloy, used for high power electric systems. MIP Spline technology accommodates both long and short travel suspensions. Comes with 6mm bores for new style output shafts. Black Oxide and coated with Wax.