Features： 1、High 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. 2、High Shaft Strength: The crank is made of aluminum alloy, light weight, stylish and very cool looking, with a strong and compatible shaft. 3、Easy 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. 4、Versatile 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. Specification： Item Type: 10 Speed Bicycle Groupset Material: Aluminum Alloy Weight: 2320g / 81.84oz 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 Chainring