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: 86mmMinimum Thickness: 2.5mmDisc Position: Front Left Fits: Yamaha DT200R 1989-1998 IT200 1986-1987 TT250 1986-1992 TT350 1986-1998 TT600 1982-1994 WR500Z 1992-1993 YZ125 1988 YZ250 1988-1989 YZ490 1988-1990