Key Features: (2) Rear Tires (1) Rear Axle Assembly with Crown Gear (25T) and Wheels (2) Pick-Up-Shoes (4) Pick-Up-Shoe Springs (1) Motor Clip (1) Pinion Gear (7 Tooth) (1) Guide Pin Overview: As good as AFX cars are, they won't run forever without a little maintenance every so often. (Kind of like humans.) And the SRT Tune-Up Kit gives you everything you need to keep your cars running strong.