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: 245mmI.D: 118mmMinimum Thickness: 2.5mmDisc Position: Front Left Fits: Yamaha WR250 Z 3RB 1992-1993 WR250 Z 4JW 1994-1997 WR250Z 1998-2002 WR400F 1998-2000 YZ125 1992 1994-2000 YZ250 1992-1996 1998-2000 YZ400F 1998-1999 YZ426F 2000