MEElectronics Clarity Series CC51-WT Ceramic In-Ear Headphone for iPod, iPhone, MP3/CD/DVD Players -White (Discontinued by Manufacturer) Ceramic housing that is acoustically inert, eliminating resonance for more accurate sound Powerful yet balanced full-range 6.0 mm micro-driver delivering high levels of accuracy and dynamics Driver: 6.0 mm micro-drivers Frequency Response: 18Hz-20KHz Sensitivity: 98 dB