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: 206mmI.D: 89mmMinimum Thickness: 4mmDisc Position: Rear Fits: Polaris ATP 330 4x4 2004-2005 ATP 500 4x4 2004-2005 ATV PRO 500 2002 MAGNUM 325 (2WD) 2002 MAGNUM 325 (4WD) 2001 MAGNUM 325 4x4 2002 MAGNUM 325 4x4 HDS 2001-2002 MAGNUM 330 2x4 2003-2005 MAGNUM 330 4x4 2003-2005 MAGNUM 500 4x4 2001-2003 Xpedition 325 2002