This is a Team Losi 45 tooth Plastic Spur Gear, intended for use with the Losi 8ight-E series vehicles. These spur gears are made of highly durable plastic that has been specifically designed for the rigors of 1/8-scale electric buggy and truggy racing. Plastic Spur Gears enhance the sound of the gear mesh making the car quieter. The new Losi Plastic spur gears include a steel insert for improved overall strength and longevity, and the steel insert stays on the center differential when the spur gear is removed, allowing you to change your spur gear quickly and easily.