Denon AH-D7000 Ultra Reference Over-Ear Headphones (Black) Custom-crafted real mahogany wood housings finished in piano grade satin sheen. 50mm diameter free edge Microfiber diaphragms driven by high strength Neodymium magnets deliver efficiency. Denon's exclusive Acoustic Optimizer technology equalizes the sound pressure in front and behind the Microfiber drivers improving detail and dynamics. The lightweight tangle-free cable features reference grade 7N OFC (7 Nines  99.99999% Oxygen Free Copper) Luxurious soft leather ear pads and headband.