Dyna-Sys 10-speed shifters with Vivid indexing and 2-Way release to exceed the demands of ever changing bicycle designs and riding stylesLight to the touch but positive and crisp, Vivid indexing provides a constant amount of shift lever force across all 10 sprockets2-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 fingerMulti-bearing design uses two ball bearing units to provide a low-friction and reliable shifting actionOne piece lower alloy thumb release lever increases durability and gives sharp precise shiftsFor use with Dyna-Sys 10-speed onlyRemovable optical gear display allows the use of these shifters with any brake leverRaised optical gear display instantly shows you what gear you're in and allows clearance for suspension lock out clamps belowMulti-position adjustable handlebar clamp for custom lever positioningAverage weight 255 grams