TDKs Super Finavinx ultra-fine magnetic particle formulation is a mature technology that TDK evolved from other recording media products for this new application. TDKs advanced coating equipment controls the thickness of the Super Finavinx layer down to one nanometer (one one-billionth of a meter). A special nonmagnetic layer and ultra-smooth base film create a completely even foundation for the Super Finavinx coating. The results are total uniformity and exceptional stability. Super Finavinx is the only Ultrium coating formulation that over many years has been proven to thrive in real world applications.