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 wave discs are engineered and designed to give your ride a great look without compromising your safety. The gentle wave design limits uneven wear that can cause pulsating resulting in premature replacement. Some motorcycles OEM discs are wave designs while we have others that are designed as an alternative upgrade to OEM solid discs.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: 200mmI.D: 110mmMinimum Thickness: 3.5mmDisc Position: Rear Fits: KTM 105 SX 2006-2008 105 XC 2008-2009 85 SX (Big Wheel) 2004-2010 85 SX (Small Wheel) 2003-2010