Upgrade your bike with the aluminum thumb bike accessory speed controller, designed for cyclists who value efficiency and control. This split thumb offers smooth and accurate gear changes, enhancing your overall riding experience. Made from durable aluminum, it withstands the rigors of both urban commuting and off- . Installation is simple, and once mounted, it provides a secure and comfortable grip, allowing you to focus on without worrying about gear shifting issues. Features -Color:Black -Material:Aluminum Plastic -Size:11.00X5.50X3.50cm/4.32X2.16X1.38in -durable aluminum material: constructed from durable aluminum, these shifters are both lightweight and durable, ensuring they can withstand the rigors of cycling -Ergonomic grip: the ergonomic design of these shifters provides a comfortable grip, reducing hand fatigue and making gear changes more intuitive and efficient -Universal compatibility: these shifters are compatible with a wide range of bicycles, making them a versatile choice for any cyclist looking to upgrade their gear - adjustment: the split design allows for easy and precise gear adjustments, giving you better control over your bike's performance -Improved riding efficiency: with the ability to quickly and efficiently , these shifters enhance your overall riding efficiency, making every ride more enjoyable and effective Package list: A pair of bicycle shifters