Hudz Ultegra 6600 - Medium/Soft Red For use with 10-speed Shimano Ultegra 6600, Ultegra SL, 105 series-5600, and R700 systems including 6600, 6601 and 6603 STI levers. Not compatible with 8- or 9-speed STI levers 6mm of additional height added to the lever to fit and support your hand better (because the lever is wider and longer than the Dura-Ace 7800 less additional height is required) OE part number: Y-6K2-98100 Hudz signiture finger contours on underside Hudz brake lever hoods feature added material in key areas to improve comfort and ergonomics.