Sony offers the MDR-E829V 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. Neodymium magnet allows for maximum energy in minimum size. Neodymium is far more powerful than conventional Samarium Cobalt or Aluminum magnets. 16 mm Diameter Driver is small enough to fit inside your ear. Rotary slide type volume is provided control for easy volume level adjustment. Compact case neatly stores the ear-buds and headphone cord when not in use and is ideal for carrying in a pocket or purse.