Features: 1Steel Plate Cassette: 10 speed cassette adopts high strength steel plate, quenching process, tempering hardening treatment, multi layer electroplating, rust prevention, tooth loss design, smoother speed change. 2Aluminum Alloy Crank: The crank is made of aluminum alloy, with light weight, fashionable appearance, dazzling design, strong axial strength, and strong compatibility. 3Good Workmanship: Road bike 10 speed groupset, with exquisite workmanship and beautiful appearance, provides you great using experience. 4Bicycle Gift: You can find the bike 10 speed groupset as a bicycle gift for your husband, wife, boyfriend, girlfriend, or your children. 5Package List: 1 x Cassette, 3 x Cassette Accessory, 1 x Tail Hook, 1 x Tail Hook Screw, 1 x Front Thumb Shifter, 1 x Rear Thumb Shifter, 1 x Chain, 2 x Chain Buckle, 1 x Chain Box, 1 x Left Crank, 1 x Right Crank, 1 x Bottom Bracket, 10 x Crank Accessories, 1 x Crankset. Package included: 1 x&nbspCassette 3 x&nbspCassette&nbspAccessory 1 x Tail Hook&nbsp 1 x Tail Hook Screw&nbsp 1 x Front&nbspThumb Shifter 1 x Rear Thumb Shifter 1 x Chain&nbsp 2 x Chain Buckle&nbsp 1 x Chain Box&nbsp 1 x Left Crank&nbsp 1 x Right Crank&nbsp 1 x Bottom Bracket 10 x Crank Accessories&nbsp 1 x Crankset