The Shimano Dura Ace Inline Gear Indicator is a simple and genius indicator for rear 9/10 speed use. It installs between the shifter cable-exit and 4mm housing. It has a clear window with a red colored grommet which indicates your position. The DuraAce logo is clearly labeled on the body just to remind everyone that you ride the best equipement available. Note: This gear indicator is compatible with ALL models of Shimano 9 and 10 speed shifterlevers.