Made of 7075 aluminum alloy materialHardening and anti-rust processInner diameter 3.17mm 32P motor gears for 1/10 1/8 RC CarSpecifications:Mould: 0.8Inner Diameter: 3.175mmFor motor shaft diameter: 3.175mmGear Tooth: 13T 14T 15T 16T 17TColour: YellowMaterial: aluminum alloyPackage Contents:1 x 13T Motor Gear1 x 14T Motor Gear1 x 15T Motor Gear1 x 16T Motor Gear1 x 17T Motor GearOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.