Feature:1. Made of high quality steel material, adopt professional manufacturing, with high reliability and stable performance.2. High standard workmanship makes it a better replacement for electric bicycle and scooter.3. Exquisite design, it is strong and for has a long service life, high cost performance.4. Lightweight and stable, without adding any durden on your bike, a good choice for scooter owner.5. The 37 teeth sprocket is easy to install and convenient to operate, even beginner can fast learn to use it.Spec:Condition: 100% Brand NewItem Type: Rear SprocketMaterial: SteelColor: As Picture ShownProduct Outter Diameter: Approx. 15.4cm/6.1inProduct Inner Diameter: Approx. 3.7cm/1.5inWeight: Approx. 546.0g/19.3ozPackage List:1 x Rear Sprocket