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: Honda CBR900RR FIREBLADE 1992-1993 GL1500C VALKYRIE 2000-2003 GL1800 GOLDWING 2001-2017 GL1800 Goldwing A 2001-2010 VFR800Fi 1998-2013