The Dura Type insert pad was originally developed as an aftermarket upgrade for high end Shimano brake systems. The Kool-Stop Dura pads are the same spec as Shimano pads and fit Shimano, SRAM, TRP and Tektro holders with a set screw. Compounds: - Black: Kool-Stop's standard compound which is great for all weather conditions, but designed for dry condition riding. - Ceramic: This compound was designed for ceramic coated rims and is great in all weather conditions. - Salmon: Kool-Stop's most famous Salmon compound is also one of the most aggressive compounds for extreme all weather conditions especially in the wet, but still superb in the dry. - Carbon: Kool-Stop's original carbon compound which works great for most carbon wheels but will wear quicker on fast steep descents. - Dual: A fusion of Kool-Stop's two finest compounds which will give superb braking in all weather conditions. This combination produces a more controlled smooth stop! Features: - Patented Plow Tip - Water Grooves - Rim Friendly Compounds - Fits 55mm length holders