Sony MDR-XB300 Extra Bass Headphones 30mm driver units - exclusively engineered by Sony, the extra-large 30mm Extra Bass diaphragm driver units accurately reproduce ultra-low frequency sounds and deliver powerful, deep bass reproduction Direct vibe structure - built with a direct vibe structure to ensure high audio fidelity, the Extra Bass Headphones feature a tightly sealed acoustic design that allows for a high level of sound isolation which reproduces powerful and extended bass sound Closed design - experience comfortable listening with the Extra Bass Headphones' over-the head, on the ear supra aural closed design. The drivers inside the ear cups are angled parallel to your ears to not only reduce pressure, but also increase comfort and deliver an unbelievable listening experience Optimal sound quality - sound leakage and a loss in audio quality are minimized thanks to a sealed acoustic design. Additionally, the MDR-XB300 Headphones have an exceptionally wide frequency response from 5-22,000 Hz King sized ear cushion - providing more than exceptional sound, the Extra Bass Headphones feature ultra-thick, pressure-relieving ear cushions for supreme comfort and better acoustic performance; each ear cup measures 1.2 inches in thickness and 3.1 inches in diameter; additionally, a seamless structure design offers enhanced wearing comfort