The Premium brake discs we offer as an OE replacement part. Also in OE Replacement section we attach great importance to manufacture high quality products so as to ensure your safety. All EBC Premium brake discs are made from cast iron SAEJ431 G3000 and have a tensile strength of 150 N / m2 with a variation in the surface hardness of max. 20HB. Our premium rotors are machined to a surface tolerance of 0.01mm CNC. So it is not a cheap import product, but a high quality OE replacement part that is inferor to the quality of the original built-in brake discs nothing.