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: 220mmI.D: 102mmMinimum Thickness: 4.5mmDisc Position: Rear Fits: Aprilia RSV1000 MILLE 1998-2003 SL1000 FALCO 1999-2005 TUONO 1000 2002-2005 TUONO 1000R (Radial Caliper) 2006-2011 TUONO 1000R Factory (Radial Caliper) 2006-2013