KOSS TD85 Home Stereophones Oxygen free Copper Voice Coils Improve Signal Transmission & Conduction For Cleaner, Clearer Sound.Connectivity Technology: Wired Adjustable Headband & Large Leatherette Ear Cushions For Custom Fit Robust Construction, Yet Surprisingly Lightweight & Comfortable freq Resp: 20hz - 17khz imp: 60 Ohms Frequency Response: 20-17,000 Hz Dynamic element for extended frequency response Closed leatherette ear cushion for maximum isolation and deep bass Adjustable, vinyl-covered headband adapts to individual head size, Ultra durable for daily use Coiled, single entry 8ft. Cord