Features: 110 SPEED GEAR SYSTEM: Provides a wider range of gears for better control and acceleration on flat and downhill terrains and cycling conditions, making it a versatile and efficient choice for commuting, travel, or road biking. 2HIGH STRENGTH FREEWHEEL: The flywheel is made of high strength steel plate with quenching process, tempered hardening treatment, multi layer electroplating, rust free and anti skid design for fine shifting. 3LIGHTWEIGHT CRANKSET: The crankarm is made of aluminum alloy, which is lightweight, stylish appearance, fashionable design, high axle strength, and strong compatibility with most bike models. 4FINE GEAR SHIFTING: With trigger shift and rear derailleur chain set, our bike gear kit makes it possible that gearing shifts are much finer and easier to operate than traditional shifters. 5PERFECT GIFT: This bike gear set is an ideal gift for your husband, wife, boyfriend, girlfriend, or kids' bike, suitable for scenes such as back to school, Christmas, Valentine's Day, Mother's Day or Father's Day, Thanksgiving, or New Year's gift. Package included: 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 Buckle 1 x Chain Case 1 x Left Crank Arm 1 x Right Crank Arm 1 x Bottom Bracket 1 x Crank Accessory 1 x Chainring