Sony MDR7506 Professional Large Diaphragm Headphone Neodymium magnets and 40mm drivers for powerful, detailed sound Closed-ear design provides comfort and outstanding reduction of external noises 9.8-foot cord ends in gold-plated plug and it is not detachable; 1/4-inch adapter included Folds up for storage or travel in provided soft case Frequency Response: 10Hz - 20 kHz These large diaphragm, foldable headphones feature a rugged construction, a secure, highly effective closed-ear design