These Shimano Revo twist shifters feature as original equipment on a number of bikes and would be an ideal replacement for worn of broken shifters.The right hand shifter is a 6 speed indexed unit fully compatible with shimano rear gear systems, with an optical gear display, to let you know which gear you are using. The left shifter offers features multi position friction shifting and is compatible with Shimano front gears .This kit also includes inner gear cables.