Features1High Strength: The flywheel is made of high strength steel plate, quenching process, tempering and hardening treatment, multi layer electroplating, rust prevention, drop gear design, smoother shifting. 2High Shaft Strength: The crank is made of aluminium alloy, light weight, stylish and very cool looking, with a strong and compatible shaft. 3 Gift: The 9 speed groupset is a gift for your husband, wife, boyfriend, girlfriend, or for your child'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. 4Versatile Performance: The groupset is designed to provide versatile performance, making it suitable for a range of riding styles and terrains. Whether you're tackling hills, cruising through flat terrain, or sprinting, the groupset provides the flexibility and range needed to handle any cycling challenge. 5Easy to Install: The groupset is designed to be easy to install, with all the necessary components included in the kit. The groupset can be easily installed on any compatible bike frame, allowing you to upgrade your bike's performance in no time.SpecificationItem Type: 9 Speed GroupsetMaterial: Aluminium alloy steelNumber of Teeth: 11 13 16 20 24 28 32 36 42TPackage List1 xFlywheel3 x Flywheel Accessory1 x Tail Hook1 x Tail Hook Screw1 x Front Derailleur1 x Rear Derailleur1 x Chain2 x Chain Link1 x Chain Case1 x Left Crank1 x Right Crank1 xBottom Bracket10 x Crank Accessory1 x Crankset