Model: 3x7 Speed Twist Shifter with Handle Grips Set. The Cable lenghth for 3 speed shifter is 175cm, the cable length for 7 speed shifter is 220cm. Application: They are suitable for 21 speed mountain bike, commuter bikes, folding bicycles, kids or youth bike. Handlebar Grips fit for any standard straight bicycle, kids bike or stunt scooter handlebar. For a bicycle shift. Comfortable and smoth shifter, soft handlebar grips. The Twist Shifter Set minimize fatigue in your hands, wrists, and elbows on long rides. Good grip,better handling,this design is more space-saving.