The shimano deore sl m610 10 speed rapidfire shifters deore mountain bike rapidfire shifter pods featuring 2 way release for cost effective dyna sys 10 speed shifting performance light to the touch but positive and crisp vivid indexing provides a constant amount of shift lever force across all 10 sprockets shimano deore sl m610 10 speed rapidfire shifters features 2 way release allows shifting from various riding positions the upper lever still performs the same shift function but it