The Sony MDR-7506 Professional Large Diaphragm Headphone is a large diaphragm foldable headphone designed for professional studio and live/broadcast applications. These large diaphragm, foldable headphones feature a rugged construction, a secure, highly effective closed-ear design, and a 40 millimeter driver unit for clean, clear sound reproduction. The closed-ear design provides both comfort and outstanding reduction of external noises. The included Stereo UniMatch plug allows use in both 1/4-inch and 1/8-inch applications. A soft case for protective storage is included with the headphones.