This kit contains 1 motor base, 1 540 motor, 1 42T reduction gear, 1 27T motor gear, and 1 heatsink cover. <br />Features: <br />This kit is compatible with WLtoys 12428 12423 1/12 RC Car.<br />Size: gear diameter: 3cm/2cm; motor base size: 3.8*3.8cm; motor: 3.5*5cm.<br />This metallic set is durable and wear-resistant.<br />The heatsink cover can always keep your motor at the right temperature to make the motor work efficiently.<br />The motor and gears can provide strong power when the car goes up the slope. <br />Replace the old ones with these metallic ones to make your car perform better. <br/>Specifications: <br />Color: blue <br />Material: aluminum alloy <br />Size: gear diameter: 3cm/2cm; motor base size: 3.8*3.8cm; motor: 3.5*5cm<br/>Package information: <br />Size: 10*13.5*5cm<br />Weight: 240g<br/>Package list:<br />1*540 Motor <br />1*Motor Base<br />1*Motor Heatsink Cover<br />1*Motor Gear <br />1*Reduction Gear