This disc is built locally in our workshop. Both sides of the disc are metal material which is designed to provide an aggressive feel. Many times the clutch disc goes out before the pressure plate and so we wanted to offer a replacement clutch disc that will serve as an upgrade. The measurements are 250mm 24T 1 inch, which will fit the standard clutch on the Z models and G35/G37. It won't fit the Luk self adjustment clutch pressure plate.