Features1Flywheel Features: Flywheel high strength steel plate, quenching process, tempering hardening treatment, multi layer electroplating, anti rust, tooth dropping design, smoother shifting. 2Chain Features: The chain has low friction, smooth shifting, light weight and long life, providing you great using experience. 3Crank Features: The crank is made of aluminum alloy, which is light in weight, stylish in appearance, dazzling in shape, strong in the axle center, and strong in compatibility. 4 Gift: You can find it as a gift for your husband, wife, boyfriend, girlfriend, or your kid's bike, or as a back to school gift, Christmas gift, Valentine's Day gift, Mother's Day or Father's Day gift, Thanksgiving Gift or New Year's Gift 5Package List: 2 crank, 2 crank accessories, 4 crank bolt, 4 crank screw, 1 central axis, 1 finger throttle, 1 rear derailleur, 1 rear derailleur screw, 1 tail hook, 1 flywheel, 3 flywheel gear, 1 crankset, 1 chain, 2 chain link.SpecificationItem Type: Bike CrankFingerThrottleRearDerailleurChainSetMaterial: Aluminum AlloyColor: As Pictures ShownWeight: Approx. 2188g / 77.2ozFlywheel Gear Ratio: 11T, 13T, 16T, 20T, 24T, 28T 34T, 40TPackage List2 x Crank2 x Crank Accessories4 x Crank Bolt4 x Crank Screw1 x Central Axis1 xFinger Throttle1 xRear Derailleur1 xRear Derailleur Screw1 x Tail Hook1 x Flywheel3 x Flywheel Gear1 x Crankset1 x Chain2 x Chain Link