Features1BIKE FREEWHEEL SET: Including variable speed freewheel, hollow integrated crank, front rear derailleur, chain, tail hook and accessories. 2HIGH STRENGTH: The flywheel is made of high strength steel plate and quenched process, has been tempered and hardened, making it very sturdy. 3RUST PREVENTION: The freewheel is treated with multiple layers of electroplating for rust prevention, longer service life, and smoother speed change. 4ALUMINUM ALLOY CRANK: The crank is made of aluminum alloy, with light weight, fashionable appearance, strong axial strength, and strong compatibility. 5DIY USE: This set is great for family or friends who enjoy cycling, allowing them to DIY their own bikes and upgrade performance.SpecificationItem Type:9 Speed FreewheelMaterial: Aluminum AlloyTeeth Number: 11-13-16-20-24-28-34-40-46TPackage List1 x 9 Speed Freewheel3 x Freewheel Accessories1 x Tail Hook1 x Tail Hook Accessory1 x Front Derailleur1 x Rear Derailleur1 x Chain2 x Chain Buckle1 x Chain Box1 x Left Crank1 x Right Crank1 xBottom Bracket10 x Crank Accessories1 x Crankset