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: 320mmI.D: 132mmMinimum Thickness: 6mmDisc Position: Rear Fits: Yamaha XV1600A ROAD STAR 1999-2007 XV1700 ROAD STAR MIDNIGHT 2008 XV1700 Road Star 2004-2008 XV1900A ROADLINER 2006-2018