Clarks Organic Disc Brake Pads For Shimano Deore Hydraulic Br-M555/M556Organic VX Pads are specifically designed to give the best performance under normal conditions. The organic compound gives improved noise reduction as well as increased âbiteâ.Sintered VRX Pads are a harder compound pad with increased carbon content. Sintered pads are designed to deliver maximum performance under stress and extreme conditions. Consistent through sustained riding they are ideal for hydraulic brake systems.CompatibilityShimano Deore M555Shimano Deore M556Shimano BR-C901 Nexave