When every gram counts, count on Shimano&';s XTR 2 piston hydraulic disc brake. 26 grams lighter, 10% stiffer, 8% more rigid and 10% more braking power, 30% less time lag. In the end figures do count Lightweight & Powerful XC Brake Design Improved lever ergonomics 1-piece aluminum caliper Quicker rebound between actions maintains rider concentration Greater flexibility and action-optimized cockpit layout Update brake lever shape 10% stiffer than M9000 even under high temp conditions Magnesium master cylinder 26 g lighter (vs. BL/BR-M9000 with disc brake rotor) Series: XTR M9100 Series Brake Hose: SM-BH90-SS Compatible with I-Spec EV shift levers Lever Size: 2-finger Oil: Shimano Mineral oil Brake Caliper: 2-piston Brake Pads: K04Ti metal pads without fins Weight: 312g. Color: grey