The Sony MDRE9LP Earbud Headphones let you enjoy your music in high-quality sound with these earbud headphones that feature 13.5mm drivers and a neodymium magnet to deliver clear, crisp audio. The rubber ear cushions ensure comfort for extended listening. Sony MDRE9LP Earbud Headphones: Earbud design directs sound into the ear for deep bass Neodymium magnet offers sound reinforcement 13.5mm drivers Rubber ear cushions Lightweight design for simple portability Frequency Response: 18Hz - 22kHz 16 ohms impedance