🎶 Elevate Your Sound Experience! 2 mil. aluminum-coated diaphragms minimize mechanical distortion for accurate sound reproduction. Leatherette ear cushions create a light seal for enhanced bass while allowing ambient sound. Optimized neodymium iron boron magnets provide greater volume, even with low-voltage devices. Dynamic elements deliver a wide frequency response from 15-22,000 Hz, ensuring every note is crystal clear. Combines closed and open styles for an immersive yet aware listening experience. 15-22k Hz range Oxygen-free copper Neodymium magnets The Koss UR40 Collapsible Over-Ear Headphones offer a dynamic sound experience with a frequency response of 15-22,000 Hz, featuring advanced neodymium magnets for powerful audio performance. Designed with a hybrid structure, these headphones provide both closed and open listening styles, ensuring comfort and awareness. The use of oxygen-free copper voice coils enhances signal clarity, making them perfect for music lovers who crave high-quality sound on the go.