The Tektro HD-M535 disc brake and lever set is an open system, 4-piston hydraulic post mount brake that offers powerful and controllable braking, making it a solid choice for MTBs and eMTBs alike. - Forged aluminum 4-piston caliper includes 5mm performance pads and uses mineral oil that's extremely heat stable - Brake lever features an aluminum 2-finger lever blade with dimples for extra grip and a cast aluminum, one-piece bracket - Reach adjustment allows riders to get the proper fit - Easy installation, adjustment and maintenance - 5 x 1900mm brake hose - Compatible with 2.3mm rotors (sold separately) - Recommended for eBikes with center mount motor