This is the Radio Controlled, Electric Powered, Pro-Comp Rocket Dirt Oval Kit from Custom Works R/C Cars. Designed for Dirt Oval racing using rubber tires on loose dirt or hard packed tracks. FEATURES: Chassis: Carbon fiber 0.098" (2.5mm) thick Drive: Rear wheel Shocks: MDX oil filled, aluminum body with one-piece aluminum caps Shock Towers: Carbon Fiber 0.098" (2.5mm) thick Differential: Ball type with ceramic diff balls Spur Gear: 81 tooth 48 pitch composite construction Steering: Adjustable Ackermann, Ackermann describes the effect of the inside front wheel turning faster than the outer front wheel during turns Caster: Adjustable front and rear, caster/toe-in refers to the angle of the front suspension when viewed from the side of the car in relation to the chassis Camber: Adjustable, camber refers to the angle of the tops of the tires from vertical when viewed from front or behind vehicle Transmission: Ball bearing equipped, single speed INCLUDES: Pro-Comp Rocket Dirt Oval Kit with Shocks, Battery Mount Straps, Ball Differential, Decal Sheet and Instructions REQUIRES: Radio: 2-channel with high speed steering servo Motor: 05 size brushed or brushless ESC: To match selected motor Battery: 2S LiPo at least 5000mAh Battery Charger: Compatible with selected battery Tires and Wheels: Dirt oval Pinion Gear, Shock and Diff Oil, Body, Building and Track Equipment SPECS: Dimensions are not provided. Contact manufacturer for further info. COMMENTS: For Replacement Ball Bearings use: Qty. Size Location Qty. Bearing Set 4 3/16x3/8" Rear Bearing Carriers 2 DTXC1423 2 3/16x3/8" Transmission 1 DTXC1423 2 3/8x5/8" Transmission 1 DTXC1437 2 5/32x5/16" Diff 1 DTXC1411 jxs 12/18/12 ir/jxs