Material: The gear is made of high-quality metal material, which has a longer service life, more durable and more wear-resistant. Advantages: The wider coarse gear teeth and the deeper gear groove can withstand greater force, which makes the RC car more stable and faster. Pitch&Teeth: Please ensure that your spur gear and pinion gear have the same pitch, otherwise the teeth will not mesh, and wider gear teeth and deeper gear grooves can withstand greater force. Stable Performance: Compared with other small gears, our gears have good machining performance, which can reduce roughness and noise, and make them roll smoothly. Application: Suitable for 1/8 1/10 RC brushless motors for cars and trucks. The six-piece set provides you with more choices and can help you make RC cars perform their best. Features: Not easy to slip. The gear surface is hard anodized. Anti-rust treatment of gear surface. Easy installation and long service life. Suitable for brushless motors of 1/8 1/10 RC cars and trucks. Metal materials have a longer service life, are more durable and wear-resistant. Wider thick gear teeth and deeper gear grooves can withstand greater forces. Specifications: - Material: Metal - Teeth: 11T 12T 13T 14T 15T 16T - For1/8 RC Car Colour: Black Package Includes: - 1 X 5mm 11T pinion gear - 1 X 5mm 12T pinion gear - 1 X 5mm 13T pinion gear - 1 X 5mm 14T pinion gear - 1 X 5mm 15T pinion gear - 1 X 5mm 16T pinion gear - 1 X Hex Key Note: Product size is purely manual measurement, please allow 1-2mm error. If you have any questions after receiving our products, please contact us in time, thank you!