9-series: 4 piston; 1 piece pad 8-series: 4 piston; 2 piece pad 7-series: 2 piston; 1 piece pad 6-series: Legacy*.1 / .P Performance series offers better grip*.2 Enduro series offers longer pad life*.C series offers improved control over bite and extended pad life*.4 series is a soft organic compound for improved power, heat management, and less noise*.S Sport series - Due to its powerful braking capabilities together with high durability and shorter bed-in time, this is a perfect brake pad for use with e-bikes41MT 5/7OrganicPerformanceMaguraSteel