Koss SP540 Full Size Dynamic Headphones, Black with Silver Accents Unique D-Profile echoes the shape of the ear, perfecting sound and fit Detachable single-entry cable adds versatility for quick storage and portability Metal reinforced pivots provide added strength and support Contour Sealing Cushion - the unique D-profile closes gaps around the ear, improving comfort, fit, isolation, and sound Koss PLX40 Dynamic Element precisely tuned to feature crisp highs, robust mids and smooth lows for the ultimate personal listening experience. Connectivity Technology: Wired Detachable