(ZTTO 11 Speed Cassette 11‑40T Mountain Bike Freewheel Cassette Sprocket.

Feature: \n 1. It is made of high\u2011strength steel tempering and quenching process, which has higher strength, durability and strong wear resistance.\n2. With Strong oxidation resistance, it is not easy to rust and has long service life, can be used with confidence.\n3. It uses a hollow design for reduced weight and will not add too much burden to your bicycle when using it.\n4. The surface adopts chrome plating technology, and the silver surface has a delicate appearance.\n5. Professional manufacturing, it can directly replace your old or broken freewheel. Wonderful accessory for mountain bike and Road cycling. \n\nSpecification: \n\nItem Type: Freewheel Cassette\nMaterial: Steel\nProduct Color: Black and Silver\nProduct Weight: Approx. 632g / 22.3oz\nSpeed: 11 speed\nNumber of Teeth: 11 speed 11-40T\nCompatible: For and many other speed control system\n\nPackage List: \n1 x Flywheel\n2 x Sprocket\n1 x Flywheel Cover \n\nNote: \n After the installation is complete, check whether: