These are the optional Hot Racing steel main center drive shafts for 5 millimeter out put shaft. FEATURES: Light weight and CNC machined from solid billet carbon steel. Heat treatment black finish. Super smooth operation shaft travel with star drive. Aluminum pin retainers. YOU WILL RECEIVE: One steel main center drive shafts. SPECIFICATIONS: 107-142millimeter (35millimeter total travel) laser engraved logo. Fits Tamiya CR01 (Front), Axial AX10 (stock), SCX10, Tamiya CC01 and custom truck (5millimeter output shaft).