As Sony's highest level of professional headphone, the 7520 is designed for critical listening applications. These headphones utilize ultra wide band 50mm HD driver units incorporating liquid crystal polymer film diaphragms. That's why the listener gets high power handling capability with great durability and unparalleled sound quality. The 7520 employs newly developed noise isolation earpads with a pliable cushion material that conforms to the natural shape of the ear, providing comfort and high acoustic isolation. This model has a lightweight magnesium alloy housing to decrease weight and increase comfort, reduce fatigue, and help prevent unnecessary vibration, plus a detachable cable. Comes complete with a gold-plated UNIMATCH 3.5mm/6.3mm adapter.