Rosewood , with case and extra silver custom cables Product highlights: large, open-back design offers spacious sound planar magnetic drivers offer low distortion, enhanced dynamics, and warm sound Fazor driver technology offers improved phase response, three-dimensional imaging, and extended frequency response a separate headphone amplifier is required to properly power these headphones for optimum sound quality Caribbean rosewood earcups with genuine lambskin leather earpads 74-inch tangle-free cable 4-pin mini XLR connectors for each earcup and 1/4" plug for connection to a home stereo or headphone amplifier includes rugged, waterproof travel case with an ultra-durable polypropylene shell and padded interior frequency response: 10-50,000 Hz sensitivity: 101 dB impedance: 70 ohms