Sennheiser Remanufactured HD600 Open Dynamic Hi-Fi Professional Stereo Headphones (Discontinued by Manufacturer) Lightweight aluminum voice coils ensure excellent transient response Neodymium ferrous magnets maintain optimum sensitivity and excellent dynamics Sophisticated design, elegantly finished in black and gray; high-quality open metal-mesh earpiece covers Detachable, Kevlar-reinforced oxygen-free-copper cable with very low handling noise Remanufactured to like-new condition; 2-year warranty