The shimano br-mt420 caliper provides consistent braking performance and reliable stopping power in all conditions. The 4 pistons caliper enhances confidence and control on downhill descents. 90% more braking power than BR-MT520 20% increase in braking power over the current BR-MT400 with 2 pistons 150% improvement in wear resistance over the current BR-MT400 at 2 pistons Brake pad: resin, metal Combination with BL-MT401 Front/rear: Front or rear Brake pad: Resin without fins Packaging: Individual packaging Color: Black