Specifications:Made of high-quality metal material, it is strong, durable, and easy to install.It runs smoothly and has excellent performance.It is designed for belt drive, which can effectively reduce noise.There are a variety of colors and specifications for you to choose.Item Name: Drive GearMaterial: MetalFeatures: Strong, Durable, Easy to Install, PortableProduct Size: 3.6cm x 3.6cm x 1.6cm/1.42" x 1.42" x 0.63" (Approx.)Aperture: A Type: 3.2mm/0.13", B Type: 3.2mm/0.13", C Type: 5.0mm/0.19", D Type: 5.0mm/0.19" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 Set of Drive Gear