Feature: 1. Applicable Models: RC motor gear is an ideal replacement for old or damaged parts, suitable for Tamiya motor gear TT01 TT02 TB02 TA05 RC cars. 2. Low Noise: Working smoothly,compared with other pinion gears,the pinion gears have good processing,roughness and low noise,which make them roll smoothly. 3. 4 Different Gears: Four kinds of gears with different tooth number specifications give you more choices in transmission ratio and make your RC car perform better. 4. Easy to Install: Accuracy machining makes the gears roll smoothly, with its own fixing screw holes, easy to install and simple to operate. 5. Steel Material: Pinion gears are made of high accuracy steel material, and the gear surfaces is heat treated for rust resistance, wear resistance and corrosion resistance. Specification: Item Type: RC Pinion Gear Set Material: Steel Color: Black Number of Teeth: 18T 19T 23T 24T Center Hole Diameter: Approx. 3.175mm / 0.13in Size of 18T: Diameter Approx. 12 x 9mm / 0.47 x 0.35in 19T Size: Diameter Approx. 12.5 x 9mm / 0.5 x 0.35in 23T Size: Diameter Approx. 15.5 x 9mm / 0.6 x 0.35in 24T Size: Diameter Approx. 16 x 9mm / 0.63 x 0.35in Application: for Tamiya AV Motor Teeth TT01 TT02 TB02 TA05 RC Car. Package List: 4 x Motor Gear 4 x Machine Screws 1 x Wrench Note: 1. Due to manual measurement, 1 to 3mm error is allowed, thank you! 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.