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: 180mmI.D: 48mmMinimum Thickness: 3mmDisc Position: Front Left or Right Fits: Yamaha YFM350FW BIG BEAR 4WD 1999 YFM350FX WOLVERINE 4WD 1995-2005 YFM350U BIG BEAR 2WD 1999 YFM400 KODIAK 2000-2002 YFM400FW BIG BEAR 4WD 2002-2006 YFM400FW BIG BEAR 4X4 2000-2001