This is the optional Robinson Racing GEN3 Slipper Unit for HPI Vehicles with the Flux Brushless System. FEATURES: Captured design to prevent slipper pad failure Hardened steel spur gear handles the extra load of brushless motors Aircraft grade billet aluminum backplate Increased surface area of the slipper pad for dependable performance YOU WILL RECEIVE: 1. Module Pitch 44 tooth Steel Spur Gear Aluminum Backplate Hex Slipper Pad 7x13mm Ball Bearing REQUIREMENTS: Removing stock slipper unit from input shaft Threadlocker (DTXR2010) for pinion screw jxs 08/02/11 ir/jxs &