The Shimano BR-MT620 hydraulic four-piston disc brake calipers bring consistent and full-power braking to the line. The calipers are built around a rigid two-piece design and offer better bike control through their new low-viscosity oil new piston seal and new heat-resistant resin piston allowing the braking system to stay stable over a wide range of temperatures.Two-piece construction provides a rigid durable designDual-diameter 4-piston design offering high power and controlNew piston seal heat resistant resin pistons and Shimano's low-viscosity oil ensure that braking remains stable over a wide range of temperatures Includes D03S-MX resin padsRecommended for use Deore BL-M6200 brake levers (sold separately)Compatible with both standard and 2.2mm thick disc brake rotors