Top choice for aftermarket upgrades Grooved for water displacement and fit 55mm length holders Dura: exact specification as Shimano pads with Kool Stop's patented plow tip, thinner than Dura 2 pads Dura 2: thicker for longer life, 7.65mm contact for narrower rims, and cutouts to reduce weight Black: standard compound designed for dry condition riding Salmon: aggressive compound for wet weather conditions Dual: combination of Salmon and Black compounds for more controlled, smoother stopping