The legendary Shimano XT 4-Pistion 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 retractionReduces disc brake rotor wobbling noise and increases braking power by 10% (vs. M8000)Four PistonBanjo 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.