Koss PRO3AA Collapsible Closedear Headphones With Adjustable Headband Closed Leatherette Ear Cushions Form A Comfortable Seal Around The Ears, Enhancing Bass Frequencies and Isolating The Listener From Ambient Noise Durable Steel and Rubber Padded Headband Features Adjustable Slide Bars To Ensure A Snug Fit Ear Cups Fold Up For Protective Storage and Portability. Connectivity Technology: Wired Collapsible design for protective storage and maximum portability Closed ear cushions for maximum bass and isolation Titanium coated high polymer diaphragm for accurate sound reproduction Neodymium Iron Boron rare earth magnet structures Oxygen free copper voice coils for signal clarity