Feature:1. Hollow out design, reduce weight, easy to install and use.2. Made of high strength steel, adopts hardening technology, with greater resistance, durability and strong wear resistance.3. Strong oxidation resistance makes it difficult to oxidize and has long storage life.4. Unique mountain bike chain gear design, you can well control the change speed function5. Professional manufacturing, directly replace your old or broken one.Spec:Condition: 100% Brand NewItem Type: Bicycle Cassette FreewheelModel: 8 Speed 46TMaterial: SteelColor: As Picture ShownTooth: 11-13-16-22-28-34-40-46TFitment: for Tx35/M310(Need to Used with Tail Hook Extender)Weight: Approx. 566gPackage List:1 x Bicycle Cassette Freewheel2 x Gear Ring1 x Lock Ring