HARDENED STEEL SPUR GEAR Precision machined, hardened steel spur gear. SOLID BILLET ALUMINUM BACKPLATE The backplate is 100% machined from aircraft grade solid billet aluminum making it very strong and very hard. It will not warp or break. The backplate uses a captured design to hold the extra thick slipper pad solidly in place. READY FOR HI-PERFORMANCE FUN?? A new bearing, instructions, and some RRP decals are also included in the kit. Hop-up your AXIAL AX10 SCORPION and unleash the power and the FUN!!! Whats Included Slipper Unit, inc - Hardened Steel Spur - Slipper Pad - Backplate - Bearing Whats Required 48P Pinion (not included Installation to your vehicle Robinson Racing Part No: RRP1550