Strong, lightweight back axle for XRAY gear diff for 1/12 & 1/10 pan cars and 1/10 formula cars. Super-light and tough graphite shaft with perfect security and smoothness for vibration-free procedure. 50percent lighter direct substitute for the steel shaft #375017 within the Gear Diff Set. Fits: #374900 XRAY Gear Differential 1/12 Pan Vehicle Set #374901 XRAY Gear Differential 1/10 Formula Set #374902 XRAY Gear Differential 1/10 Pan Vehicle Set