Experience precise and reliable shifting performance with the Shimano SL-M640 Zee Shift Lever. Designed for 10-speed drivetrains, this shift lever offers smooth and responsive gear changes for a seamless riding experience. The ergonomic design ensures comfortable operation, while the durable construction guarantees long-lasting performance on the trails. Weighing in at just 123g, this shift lever is lightweight yet robust, making it ideal for aggressive mountain biking. The Shimano SL-M640 Zee Shift Lever features a 2-way release function, allowing for instant shifts in both directions. With its crisp and accurate shifting capabilities, this shift lever is a top choice for riders seeking precision and control in their gear changes. Elevate your riding experience with the Shimano SL-M640 Zee Shift Lever.