MTX solid discs are constructed using one complete segment of Japanese SUS 420 stainless steel then heat-treated to HRC 36+-2. Lightening and drill hole patterns are as per OEM designs to improve braking performance and reduce the temperature of the disc.MTX Discs provide amazing braking control for your motorcycle. All MTX discs are designed and manufactured with world-leading cutting edge technologies:Precision CNC machined and laser-cut technologyJapanese SUS 420 Stainless SteelReplacement for Original EquipmentOEM Design; lightening & drill hole patternsSpecifications:O.D: 276mmI.D: 58mmMinimum Thickness: 4mmDisc Position: Front Left or Right Fits: Honda CB1100F 1983-1984 CB250N 1981-1982 CB750C Custom 1980-1982 CB900F 1981-1983 CBX1000 1978-1982 GL1100 1981-1983 GL1200 Gold Wing 1984-1987 VF750F 1983-1985