Features:1. Right shifter is a trigger-type 7 speed shifter, with one lever for down-shifts and a thumb button for up-shifts.2. Left shifter is a friction/ ratcheting thumb lever for triple cranksets.3. You can use only left gear shifter for 3 speed and only right shifter for 7 speed and both left and right shifter for 3x7 speed.4. Made of durable aluminum alloy material, it works perfectly for optimum performance and maximum safety and longevity.5. Suitable for mountain bike, city bike, road bike, folding bike, etc.Specifications:Model: SL-TX30 Thumb Gear Shifter 3X7 SpeedMaterial: Aluminium AlloyColor: BlackMount: Left (3 Speed)+ Right(7 Speed)Clamp: 22.2 mm/ 0.87 inchYou can choose:1. Only left gear shifter -3 speed2. Only right shifter -7 speed3. Left and right shifter -3X7 speedPacking List:1 Pair TX30 Thumb Gear Shifter (Left +Right Shifter).Note:Please note that the type of this product's outlet line part will be sent randomly, and make sure you will not mind before ordering.