The legendary Shimano XT 4-Piston Caliper brakes just keep getting better. With a quicker piston retraction, four piston power and superior modulation, you've got superb braking power for taking on any trail. Quicker Piston retraction reduces disc brake rotor wobbling noise and increases braking power by 10% (vs. M8000). Four Piston Banjo type connection and inside hose routing (banjo & bolt not included). It now features reduced disc brake rotor wobbling noise and increases braking power by 10% compared to the M8000. It's got four piston braking power which makes them ideal for trail, enduro, and all-mountain riding. As ever with Shimano, you can be assured of a high-quality design and construction, which is why they are one of the industry's leading brands. Please note that the Rotor and Adaptor are not included.