Dynamic, closed-back circumaural design with 70mm HD drivers Enjoy an expansive soundstage and extended frequency response: 4Hz - 120kHz Resonance-free 3D housing for optimal ventilation and reduced spatial resonance Includes detachable 4.4mm balanced, and 3.5mm stereo cables Genuine leather headband and ergonomic leather earpads for maximum comfort Get smooth sound at all frequencies with Fibonacci-patterned grills Sensitivity: 100 dB/mW Impedance: 64 Ω at 1 kHz Minimize resistance and signal loss with silver-coated OFC cables .