Features 1、High 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. 2、High Shaft Strength: The crank is made of aluminium alloy, light weight, stylish and very cool looking, with a strong and compatible shaft. 3、Perfect 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. 4、Versatile 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. 5、Easy 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. Item Type: 9 Speed Groupset Material: Aluminium alloy steel Number of Teeth: 11 13 16 20 24 28 32 36 42T Package List 1 x Flywheel 3 x Flywheel Accessory 1 x Tail Hook 1 x Tail Hook Screw 1 x Front Derailleur 1 x Rear Derailleur 1 x Chain 2 x Chain Link 1 x Chain Case 1 x Left Crank 1 x Right Crank 1 x Bottom Bracket 10 x Crank Accessory 1 x Crankset