Features1[Applicable Models] Suitable for 250W, 350W motor, and is often used in bicycle lithium battery modification as motor accessory. 2[Fine Workmanship] Professional manufacturing, good performance, high reliability, and improve the control performance of the product. 3[Easy Installation] Saving time and effort, and replacing old accessories can help you gain more control over your product. 4[Simple to Replace] Can be installed and replaced quickly and effortlessly, no complex operation, to meet your various need. 5[Durable Material] Motor 36 tooth nylon sprocket, made of nylon material and steel bearing, durable, not easy to deform, ensuring long service life.SpecificationItem Type: 36 Tooth GearColor: As Pictures ShownNumber of Teeth: 36 TeethMaterial: Nylon + SteelWeight: Approx.39g/1.4ozSize: Outer Diameter: 38mm/1.5in, Inner Diameter: 8mm/0.3in, Thickness: 12mm/0.5inApplicable: for 250W, 350W MotorsPackage List1 x 36 Tooth Gear