Sony MDR-CD580 CD Series Headphones with Neodymium Magnets (Discontinued by Manufacturer) 40mm Aura-Nomic driver unit pumps out deep, natural bass Neodymium Magnet provides 5 times the sound energy of a ferrite magnet Gold-plated UniMatch plug adaptor 10 - 25k Hz range exceeds average human hearing Replaceable, comfortable, cloth earpads