Features1High Strength: The flywheel is made of high strength steel plate, quenching process, tempering hardening treatment, multi layer electroplating, rust prevention, drop gear design, smoother gear change. 2High Shaft Strength: The crank is made of aluminum alloy, light weight, stylish and very cool looking, with a strong and compatible shaft. 3Easy Installation: All necessary components are included in the kit. Can be easily installed on any compatible bike, allowing you to upgrade your bike's performance in no time. 4Versatile Performance: The kit is designed to provide versatile performance for a range of riding styles and terrain. Whether you're climbing, cruising on the flats, or sprinting, this kit provides the flexibility needed to handle any riding challenge. 5 Gift: The 10 speed groupset is a gift for your husband, wife, boyfriend, girlfriend, or for your child's bike, as a back to school gift, Christmas gift, Valentine's Day gift.SpecificationItem Type: 10 Speed BicycleGroupsetMaterial: Aluminum AlloyWeight: 2320g / 81.84ozPackage List1 x Flywheel3 x Flywheel Accessory1 x Tail Hook1 x Tail Hook Screw1 x Front Derailleur1 x Rear Derailleur1 xChain2 xChainLink1 xChainCase1 x Left Crank1 x Right Crank1 xBottom Bracket10 x Crank Accessory1 x Chainring