Sony MDR-SA5000 DJ Stereo Headphones (Old Version) Magnesium frame structure for super lightweight headphones Utilizes modern nanocomposite diaphragms to increase frequency range 50 millimeter diameter, dome-type driver unit Open-air design with leather ear pads and pressure dispersion pad for comfort Neodymium magnets (360 kJ/m3) for powerful bass and clear treble sounds 50Mm Nano-Composite High-Definition Drivers Open-Air Design; 1500 Mw Super-Lightweight Magnesium Frame