Welcome to the "ZTTO Official Store"! Item Name: Cassette Sprocket Material:Steel Type: Super Fluid Drive Positioning Number of Gears: 11-13-15-18-21-24-28-32-36T Size:14.5cmx14.5cmx5cm/5.71inx5.71inx1.97in Description: Strong oxidation resistance makes it difficult to rust and has a long service life. The hollow design reduces the weight and has no extra load on the bicycle. Made of steel, it has higher strength, durability and high wear resistance. The length of this product is 14.5cm, the width is 14.5cm and the height is 5cm. This cassette is a cassette sprocket for 9-speed shift mountain bike. Notes: We are specialized in selling bicycle accessories, if you have a need, remember to pay attention to us! Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Cassette Sprocket