[Perfet Fit] - The rear sprocket perfet fit for SUR RON ULTRA BEE. [Prenuim Material] - The sprocket made of aluminum alloy, which is the strongest aluminum available. Suitable for continuous use on all adventures. CNC Machining,the is anodized,anti-rust and . [54 Teeth] - Sprocket for Sur Ron Ultrabee has 54 teeth. If you were at first 48 teeth, this will increase the torque of your dirt bike, making it powerful at low speeds and slightly reducing the top speed. [Easy to Install] - Design and develop according to the vehicle, perfit fit your love bike. Colour:Black Material:Aluminum Alloy Package Contents: 1 x Chain Sprocket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.