The ZEE SL-M640 Shifter works with Shimano's 10-speed derailleurs to provide consistent and precise shifts. Using Rapid Fire Plus and two-way release, ZEE offers that crisp, multi-directional shifting that we've come to love about Shimano. It features shorter paddles than SLX, XT, or XTR, making it ideal for gravity-oriented riding thanks to the low-profile and short lever throw.