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: 230mmI.D: 87mmMinimum Thickness: 3mmDisc Position: Rear Fits: Hyosung GT250 2005-2011 GT250 COMET 2002-2004 2012-2014 GT250R 2005-2017 GT650R 2004-2016