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: Kawasaki ER6F 650 2009-2013 ER6N 2009-2015 KLE650 VERSYS 2009-2014 NINJA 650R 2009-2015