Centric 125 Series High Carbon Alloy Brake Rotors contain an advanced metallurgy that greatly reduces the possibility of pad squeal especially with higher friction, European style brake pad compounds. Proprietary Molybdenum and Chromium alloys resist rotor cracking during high performance use or repeat stop situations. This alloy also increases the friction couple improving brake performance and stopping power. Increased Chromium and Carbon content is also more resistant to oxidation. Centric Premium Rotor with advanced metallurgy that greatly reduces pad squeal; Especially effective with higher friction, European style brake pad compounds; Added Molybdenum and Chromium to resist rotor cracking 2007 - 2008 BMW 335xi, 2007 - 2013 BMW 335i, 2009 - 2011 BMW 335d, 2009 - 2013 BMW 335i xDrive, 2011 - 2013 BMW 335is, 2011 - 2015 BMW X1