EBC Pro-Lite Contour Front Brake Rotor MD4136XC The steel used in the ebc rotor blades is a special stainless blend with higher friction effect than Boasts up to 10% improvement in friction effect improving brakes even further Weight of the x and xc series is reduced by 5-10% by using a 6 only button drive system on a lightwe The sd-system uses a square sided rivet with many advantages The sd-system of square sided buttons means that the rotor can expand inwards and outwards unrestrai