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: BMW F700GS 2012-2018 F800GS 2007-2018 F800GS ADVENTURE 2012-2018 G650GS 2010-2016 G650GS SERTAO 2012-2015