High-quality middle one-way pulley set for XRAY T2 cars is a great option part especially for rubber tires on carpet tracks or asphalt tracks. Recommended by Team XRAY for all levels of drivers from beginners to pros. The middle one-way can be used in combination with a front one-way diff which will make the car easier to drive, smoother, and have increased steering. Set includes precision-balanced layshaft, CNC-machined high-strength alu pulleys, spur gear mounting plate, top-quality sealed ball-bearings, and mounting hardware. One pulley is keyed to layshaft, other pulley contains high-grade precision hand-ground one-way bearing for ultra-smooth operation. Spur gear not included. Fits T2, T2R, T2'007.