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 CBR1000RR Fireblade 2006-2007 VTR1000 SP1 2000-2001 VTR1000 SP2 2002-2006