MTX floating discs are made from two segments of stainless steel which are riveted together to allow the outer section of stainless steel to expand under extreme temperatures. The outer section is manufactured from Japanese SUS 420 stainless steel then heat-treated to HRC 36+-2 while the centre of the disc is manufactured from steel or alloy. Fits: Husqvarna SM450R Motard 2003-2010 SM510R 2005 2010 SM510R Motard 2006-2009 SM570 2001-2004 SM610 2006 SM610 SUPERMOTARD 2002-2005