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: Triumph DAYTONA 955i 2000-2006 ROCKET III 2005-2009 ROCKET III CLASSIC 2008-2009 ROCKET III ROADSTER 2010-2019 SPEED TRIPLE 955 2002-2004 SPRINT ST 2005-2009