The Tough, aggressive & light weight SLX M670 2013 10 Speed I-Spec Rapidfire Shifter Right Hand with Vivid indexing & 2-way release function. Light to the touch but positive & crisp, Vivid indexing provides a constant amount of shift lever force across all 10 sprockets. 2-way release allows shifting from various riding positions; the upper lever still performs the same shift function, but it can now swing in either direction allowing it to be released by the thumb or index finger. For use with Dyna-Sys 10-speed only. Pod design allows the use of these shifters with any brake lever.