Galfer Standard 220mm Solid Mount Wave® Rotors are all laser cut out of a proprietary mix of virgin high carbon 420 stainless steel. Double disc-parallel to assure precision parallel flatness. After that, it is heat-treated depending on rotor specification. Built to be more durable, longer-lasting and highly predictable. Consistent feeling with increased lever feel, built to withstand track, offroad, and street abuse. Designs for proper cooling under heavy brake use and with high-quality materials to give it more bite! Providing more braking power than stock brake rotors. Direct bolt-on, replaces the stock rotor.