Feature:1. High Strength: The pinion gear is made of high accuracy chrome molybdenum alloy steel with heat treatment process, and it has super hardness and wear proof, corrosion proof, and long service life.2. Applicable Model: The exterior of the pinion gear is rust proofed and is an ideal replacement for old or damaged parts for 1/10 RC model car 3.175mm shaft motors.3. 5 Pinion Gears: Provides 5 pinion gears of 12T 13T 14T 15T 16T, giving you more choices in gear ratio and making your RC car perform better.4. Stable Performance: Compared with other pinions, our pinions have better machinability, low roughness and low noise, making them roll smoothly.5. Easy To Install: Exquisite processing makes the gears roll smoothly. Comes with fixing screw holes, easy to install and operate, with machine screws in the package.Specification:Item Type: RC Motor Pinion GearMaterial: Chrome Molybdenum Alloy SteelProduct Color: BlackGross Weight: 38g / 1.3ozNumber of Teeth: 12T 13T 14T 15T 16TGear Pitch: 32DP / 0.8MCenter Aperture: 3.175mm / 0.13in12T Size: 10.8x13mm / 0.43x0.51in13T Size: 11.8x13mm / 0.46x0.51in14T Size: 12.5x13mm / 0.49x0.51in15T Size: 13.5x13mm /0.53 x0.51in16T Size: 14.3x13mm / 0.56x0.51inApplicable Model: Suitable for 1/10 RC model car 3.175mm shaft, for Traxxas, for Arrma.Package List:5 x Motor Pinion Gear5 x Machine Screw1 x WrenchNote:1. Due to manual measurement, 13mm error is allowed, thank you!2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.