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: Suzuki GSXR1000 2005-2008 GSXR600 2006-2007 GSXR750 2006-2007 M109R BOULEVARD VZ1800 2006-2007 M109R BOULEVARD VZR1800 2008-2016 M109RBZ BOULEVARD 2015-2020 M109RZ BOULEVARD 2015-2017