Sony MDR-V250V Monitor Series Headphones with In-line Volume Control (Discontinued by Manufacturer) Wide, Molded Headband Enhances Wearing Stability and Comfort 30Mm Driver Unit For High-Quality Sound Closed, Supra-Aural Design ideal for use with portable audio sources such as MP3 or CD players Oxygen-Free Copper Connecting Cord Supra-aural design for excellent listening comfort, Volume control on cord allows for easy manipulation of music's volume 30 mm diameter drive units for delivery of broad frequency range Double-sided oxygen-free copper cord; 6.6 feet long (2 meters) Reversible earcups for single-sided monitoring