EBC sport rotors with USR Grooved series for cooler running. On a global scale Most EBC rotors are made from British castings and 100% of these are precision machined in either the UK or the USA. EBC Brakes has 14 machining centres in these two countries to manufacture these precision parts. Rotors are made from high quality grey iron to exacting standards and undergo extensive testing and rigorous quality control and are then precision machined to your chosen slot or dimple pattern.