The Shimano BR-MT420 hydraulic disc brake caliper features consistent braking performance and reliable stopping power in all conditions.Features-The 4-piston caliper instills greater downhill confidence and control-4-Piston, post mount caliper instills greater downhill confidence and control-Includes D03S resin brake padsItem Specifications-Defined Color:Black-Brake Caliper Type:Post Mount-Brake Lever Actuation:Hydraulic-Rotor Included:No-Hydraulic Fluid Type:Mineral Oil-Pad Compound:Metallic