Feature: 1. 5 Different Pinion Gear: Including 15T 16T 17T 18T 19T gear, let you have more choice in the transmission ratio, let your RC car performance better. 2. Rugged Material: Adopting 7075 aviation aluminum alloy material with hard oxidation treatment on the surface, light material with super hardness and wear resistance. 3. Work Smoothly: Compared with other pinion gears, small pinion gears have good workability, roughness and low noise, so that they roll smoothly. 4. Direct Replacement: The surface has been treated with rust prevention, is an ideal replacement for old parts or damaged motor pinion gear. 5. Application: Suitable for 1/10 RC model motor 5.0mm shaft. Precise machining, good processing makes the gear roll smoothly, simple operation. Specification: Item Type: Motor Gear Material: Aluminum alloy Number of Teeth: 15T 16T 17T 18T 19T Gear Pitch: 48DP Center Diameter: 5mm/0.2in 15T Size: Diameter 9 x 10mm / 0.35 x 0.39in 16T Size: Diameter 9.5 x 10mm / 0.37 x 0.39in 17T Size: Diameter 10 x 10mm / 0.39 x 0.39in 18T Size: Diameter 10.5 x 10mm / 0.41 x 0.39in 19T Size: Diameter 11 x 10mm / 0.43 x 0.39in Application: Suitable for 1/10 RC model motor 5.0mm shaft. Package List: 5 x Motor Gear5 x Meter Screw1 x L Shaped Wrench Note: 1. Due to manual measurement, 1‑3mm error is allowed, thank you! 2. Due to differences between different monitors, the picture may not reflect the actual color of the item.