Audio-Technica Matte Grey Professional Headphones Ultimate Bundle ATH-M50XMG Bundle Includes a pair of Matte Grey ATH-M50X Professional Headphones, a Fiio E6 Heapdphone Amp and a Slappa Black Case Proprietary 45 mm large-aperture drivers with rare earth magnets and copper-clad aluminum wire voice coils Exceptional clarity throughout an extended frequency range, with deep, accurate bass response 90 swiveling earcups for easy, one-ear monitoring FiiO E6 Headphone Amplifier for high impedance or low sensitivity Hi-fi headphones