Yeah Racing Pinion Gear Super Hard Combo set (48P 33T-38T) 6pcs #MG-48033-038 For: 1:10 EP, fit on 540 Motor Material: 7075 Aluminum 48 Pitch Pinion 33 Teeth (1 Pc), 48 Pitch Pinion 34 Teeth (1 Pc), 48 Pitch Pinion 35 Teeth (1 Pc) 48 Pitch Pinion 36 Teeth (1 Pc), 48 Pitch Pinion 37 Teeth (1 Pc), 48 Pitch Pinion 38 Teeth (1 Pc) Set Screw (6 pcs)