Sony MDR7502 Professional Studio Headphones, Black 30mm Driver Unit Closed-Ear Design, Stereo Unimatch Plug Gold Connectors and OFC Cord Connectivity technology : Wired Headphones feature a closed-ear design Wrap-around cushions deliver better sound insulation 30-millimeter driver units deliver full-range sound Gold-plated plugs for excellent signal conductivity Unimatch plug system fits miniplug and standard 0.25-inch plug for wide range compatibility Headphones feature a closed-ear design Wrap-around cushions deliver better sound insulation 30-millimeter driver units deliver full-range sound Gold-plated plugs for excellent signal conductivity Unimatch plug system fits miniplug and standard 0.25-inch plug for wide range compatibility