Sony MDR7506 Professional Large Diaphragm Headphone (International Model) No Warranty 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; 1/4-inch adapter included Folds up for storage or travel in provided soft case Frequency Response: 10Hz - 20 kHz