Features 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. Item Type: RC Motor Pinion Gear Material: Chrome Molybdenum Alloy Steel Product Color: Black Gross Weight: 38g / 1.3oz Number of Teeth: 12T 13T 14T 15T 16T Gear Pitch: 32DP / 0.8M Center Aperture: 3.175mm / 0.13in 12T Size: 10.8x13mm / 0.43x0.51in 13T Size: 11.8x13mm / 0.46x0.51in 14T Size: 12.5x13mm / 0.49x0.51in 15T Size: 13.5x13mm /0.53 x0.51in 16T Size: 14.3x13mm / 0.56x0.51in Applicable Model: Suitable for 1/10 RC model car 3.175mm shaft, for Traxxas, for Arrma Package List 5 x Motor Pinion Gear 5 x Machine Screw 1 x Wrench