Powerful fully bled xt 4 pot hydraulic servo wave disc brake for more aggressive riding styles fully bled lever and calliper comes without adapters or rotors giving you the freedom to customise to suite your bike short stroke servo-wave mechanism for quick pad engagement and more power for aggressive riding 4 oversized phenolic pistons optimized for heat insulation, lightweight and stiffness using ice tech alloy fin pads further improving heat radiation performance recommended for use with ice tech rotors for optimum braking performance in a choice of 140, 160, 180 and 203 mm lightweight forged calliper design that increases rigidity and reduces weight forged alloy brake lever for optimum strength and reliability mineral oil brake fluid is non-corrosive and less hazardous than conventional hydraulic brake fluid shim-less mounting system allows for quick setting up brake lever featuring reach and free stroke adjustment hinged clamp for quick installation i-spec-i