The Original American Stereophone Company ,Ever since we invented the world's first SP/3 stereophone back in 1958, Koss Stereophones have been bringing back the excitement of a live performance. Music lovers around the world recognize that dedication to accuracy in sound reproduction as The Sound of Koss. , ,The SP330 features the natural fitting “D-profile” earcup design first featured on the ergonomically designed Koss Pro4AAA. The D-profile mimics the shape of the ear, creating an ideal seal for the most consistent sound reproduction and an incredibly natural fit for extended personal listening sessions. , ,The slim, on-ear SP330 features the all-new Koss PLX30 dynamic elements, tuned for personal listening. , ,The supra-aural SP330 headphones feature an all-new, angled on-ear D-profile for an extremely accurate fit. The ear-shaped foam cushions which are crafted of memory foam, acoustical fabric and protein leather, create pillow-like comfort on the ears to produce a premier audio coupling experience. , ,The SP330 features outer earcups reinforced by anodized aluminum and insert-molded metal hinges, which provide strength in areas where other headphones often fail. The advanced headband design allows for both size and pressure adjustment. The SP330 headband contains soft memory foam wrapped in breathable fabric for extended comfort. The SP330 also has a detachable cord and folds flat into a slim travel case for easy portability.