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: 190mmI.D: 84mmMinimum Thickness: 2.5mmDisc Position: Rear Fits: Yamaha YZ65 2019-2021 YZ80 1993-2001 YZ80 Big wheel 1999-2001 YZ85 Small Wheel 2002-2006 2008-2021 YZ85L Big Wheel 2002-2018