Sony MDR-SA3000 DJ Stereo Headphones (Discontinued by Manufacturer) Open-Air Design Super-Lightweight Frame 50Mm Nano-Composite High-Definition Drivers Neodymium Magnet Carbon fiber reinforced polymer (CFRP) frame structure for super light weight 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