Features1Made of high quality steel material, adopt professional manufacturing, with high reliability and stable performance. 2High standard workmanship makes it a better replacement for electric bicycle and scooter. 3Exquisite design, it is strong and durable for has a long service life, high cost performance. 4Lightweight and stable, without adding any durden on your bike, a good choice for scooter owner. 5The 37 teeth sprocket is easy to install and convenient to operate, even beginner can fast learn to use it.SpecificationItem 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 List1 x Rear Sprocket