Item Type: 12 Speed 32T Cassette Freewheel_x000D_ Weight: Approx.442g / 15.6oz_x000D_ Speed Ratio: 11-12-13-14-15-17-19-21-23-25-28-32T_x000D_ Material: Nickel Chrome Steel_x000D_ Applicability: Suitable For Road Bikes 1Multi Layer Plating and Anti Rust Treatment: High tension steel plate adopts nickel chromium plating process, multi layer plating and anti rust treatment, with high accuracy tooth ratio. 2Concave and Convex Tooth Design: The concave and convex tooth design, make the speed change more gliding, weight reduction, and strong compatibility. 3Hollow Technology: The cassette adopts hollow technology, can effectively and easily reduce the weight, so that riding easier, and more gliding. Suitable for road bikes. 4Runs Smoothly: The flywheel rotates smoothly and has no noise, and can well ensure that it is closely connected with the wheel hub of the bicycle and runs smoothly. 5Manufacturing Material: Made of mickel chrome steel material, sturdy and durable, 11?12?13?14?15?17?19?21?23?25?28?32T speed ratio, which undoubtedly prolongs its service life. 1 x Flywheel 2 xSprockets 1 x Flywheel Cover