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: 198mmI.D: 92mmMinimum Thickness: 3.5mmDisc Position: Front Left or Right Fits: Polaris HAWKEYE 300 2x4 2006-2011 SPORTSMAN 300 4X4 2008-2010 SPORTSMAN 400 4X4 2008-2010 SPORTSMAN 400 HO 4x4 built after 9/16 2008 SPORTSMAN 400 HO 4x4 built before 9/16 2008