Shimano xt m780 10 speed trigger shifter setdyna sys 10 speed shifters with vivid indexing and multi and 2 way release to exceed the demands of ever changing bicycle designs and riding styles features light to the touch but positive and crisp vivid indexing provides a constant amount of shift lever force across all 10 sprockets 2 way release 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