React 2 dual piston brakes bring high tier control and braking to an accessible price point for MTB and hybrid use. Complete kit includes front and rear calipers levers pads stainless steel rotors hoses fittings and additional olives for custom hose lengths. Split lever clamp can be installed without having to remove grips or accessories. Compatible with Internation Standard and post mount configurations. 2 piston hydraulic brake caliper with self adjusting pistons . Integrated lever reach adjustment to suit all hand sizes. Uses enviromentally friendly mineral oil