Sony MDR-EX71SL/W Fontopia Earbuds for iPod Super-light design with ultra-compact 9mm drivers Soft, silicon earbuds Neodymium magnet for maximum energy in minimum size - achieves 100 dB sound pressure output from only 1 mW input power Frequency response - 6Hz - 23kHz Oxygen free copper cord for high signal transmission &amp; low noise