Hot Racing Heavy Duty Steel Spur Gear 38 Tooth, 1.0M spo disabled Light weight carbon fiber composite Light weight carbon fiber composite transmission case Longer motor mounting slot for more gear ratio combination CNC 6061 aluminum motor plate with added motor heat sink CNC 6061 aluminum arm mount More open area for a bigger motor heat sink Motor plate with mounting for slash stock rear bumper four light weight 15mm hex adapters four 15mm hex adapter four 5mm hex adapter four heavy duty Hot Racing wheel washer four 15mm cap screw four 25mm cap screw four o ring four lock pin four 5x8 shim This is the Hot Racing Purple 38 T Spur Gear for the Traxxas Revo SPECIFICATIONS: