Appropriate use on carpeting and tracks with a higher traction, the car rotates better and drives better through corners. Fits both XB4 & XB4 2WD. Aluminum backside paid off suspension system system holders with built-in Suspension Settings (I.S.S.) allows fast & easy suspension system system system geometry environment. This XRAY concept ended up being introduced into the very first XB8 now is carried around the 1/10 scale XB4. Utilizing eccentric suspension system bushings put in aluminum suspension system system obstructs, alongside additional suspension system shims, the XB4 suspension geometry is totally modified.