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: 240mmI.D: 115mmMinimum Thickness: 3.5mmDisc Position: Rear Fits: Kawasaki KLX450R 2008-2022 KX125 2003 2005-2008 KX250 2003 2005-2008 KX250F 2004 2006-2013 2015-2019 KX450F 2006-2013 2015-2018