Maxell 190560 Lightweight Extended Use Anisotrophic Ferrite Magnet Driver Dynamic Sound Reproduction Stereo Ear Bud - Black (Value) Lightweight Design For Extended Use Anisotropic Ferrite Magnet Drivers Sensitivity: 95 Db Freq Resp: 20 Hz-23 Khz Ideal for Mp3, CD players and all portable stereo devices Lightweight ear bud Designed for extended use Dynamic sound reproduction from all sources Great value!