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: 210mmI.D: 84mmMinimum Thickness: 4.5mmDisc Position: Rear Fits: Yamaha FZR250R 1989-1993 FZR400 RR 1987-1992 FZR400RR EXUP (3TJ IMPORT) 1993-1995 FZR750R (OW-01) 1989-1993 SZR660 1996-2001 TZR250 3XV 1991 TZR250T 2MA 1987-1988 TZR250W 3MA 1989-1990