Experience gear shifting with the aluminum thumb bike accessory speed controller. This split thumb is engineered for optimal performance, allowing cyclists to make quick and precise gear changes on the go. Its ergonomic design ensures a comfortable grip, reducing hand fatigue during long rides. Suitable for various types of bikes, including road and mountain bikes, this is easy to install and provides consistent, reliable performance in all riding conditions. Features -Color:Black -Material:Aluminum Plastic -Size:11.00X5.50X3.50cm/4.32X2.16X1.38in -Lightweight aluminum build: these shifters are crafted from lightweight aluminum, making them easy to handle and durable enough for longterm use -Comfortable ergonomic design: the ergonomic design provides a comfortable grip, reducing hand strain and making gear changes more comfortable and efficient -Versatile use: compatible with a wide range of bicycles, these shifters are a versatile addition to any cyclist's gear, suitable for road bikes, mountain bikes, and more -Precise speed control: the split design allows for precise speed control, making it easier to adjust gears and improve your cycling performance -Enhanced cycling experience: with the ability to quickly and easily , these shifters enhance your overall cycling experience, making every ride smoother and more enjoyable Package list: A pair of bicycle shifters