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 KLX450R 2008-2022 KX125 2006-2008 KX250 2006-2008 KX250F 2006-2013 KX450F 2006-2013