Official Shimano Product: BL-M4100 Brake lever with a BR-MT420 Caliper. Features: Fully bled hydraulic disc brake with adaptable post-style caliper Rear fully bled lever and caliper without adapters or rotors for customization Compatible with Center Lock rotor system for easy installation on Center Lock compatible hubs Can also use conventional 6-bolt rotors in 160 mm, 180 mm, and 203 mm sizes Opposed 4-piston design: Reduces leading effect Ensures optimal pad wear for increased braking control Two-piece caliper design for rigidity and durability Hinged clamp design for easy installation Specification: Ergonomic alloy brake lever for optimum comfort and performance Mineral oil brake fluid: Non-corrosive Less hazardous than conventional hydraulic fluids Shim-less mounting system for quick installation and setup I-spec-EV compatible Brake lever features reach adjustment for a custom fit Click here for compatible brake pads: Shimano D03S Resin Disc Brake Pads Genuine, brand new, boxed Shimano product - Biketart are an official UK Shimano stockist.