Strong, lightweight rear axle for XRAY gear diff for 1/12 & 1/10 pan vehicles and 1/10 formula automobiles. Super-light and tough graphite shaft with perfect balance and smoothness for vibration-free operation. 50percent lighter direct replacement for the metal shaft #375017 within the Gear Diff Set. Fits: #374900 XRAY Gear Differential 1/12 Pan Automobile Set #374901 XRAY Gear Differential 1/10 Formula Set #374902 XRAY Gear Differential 1/10 Pan Automobile Set