The shimano dura ace st 9000 dual control brake levers is an all round powerful and comfortable unit suitable for all ranges of riding styles you will not be left disappointed with the work rate that is put in by the dura ace the slr ev design provides the dura ace 9000 levers with several key benefits including a much more powerful and controllable braking amp shifting system a smaller volume hood for better control from the hood position and a much more light weight carbon material