From: Jesse Uresti Designs: NexxRacingUSA and NexxRacing.com: The first, all out, FULL RACE, High Tech, ultra-light, balanced and re-designed, high performance ceramic ball differential. Featuring: Light weight, hard anodized ALUMINUM, AXLE with dual, engineered, *machined flats, dual drilled and tapped aluminum WHEEL ADAPTER with two set screws, reduce diameter, drilled, lightened, and introducing the New, unique: reduced, drilled and lightened Hexagon keyed inner and outer aluminum HUBS and, reduced diameter Hardened and polished PRESSURE PLATES, the new reduced diameter, drilled and lightened ADJUSTMENT COLLAR with "O-Ring control," unique, reduced diameter bearing path, 53Tooth super light, 8 ceramic ball, thin, (2mm) yellow SPUR, 50% REDUCTION ROTATING LOAD for absolute vibration free, faster acceleration and braking, smoother, easier, more consistent speed and handling! Fits: all standard width motor mounts. available in NexxRacing GOLD and Gforce PURPLE! Get ahead of the competition, Go FAST? GO NexxRacing! * This version differential comes unbuilt for this super low price!