Sony offers the MDR-E811LP Fontopia Ear-Bud Stereo Headphones. Fontopia in-the-ear design fits snugly, yet comfortably inside the ear so you can enjoy music while exercising, skating or dancing. Sony Acoustic Twin Turbo Circuitry uses sound chamber and ducts for improved efficiency, gets high sonic output from your portable stereo. Silent Cap prevents sound leakage, makes your music less likely to disturb your neighbors. Neodymium magnet assures maximum energy in minimum size. Neodymium is far more powerful than conventional Samarium Cobalt or Aluminum magnets. 13.5 mm Diameter Driver is small enough to fit inside your ear. PET diaphragms ensure high rigidity for minimum distortion.