Ortofon 2m Red Moving Magnet Cartridge 2M series of cartridges feature Ortofon's trademark split pole pins The name 2M was chosen as it represents the abbreviation for moving magnet, MM. Moving magnet cartridges provide excellent compatibility in an assortment of playback systems and with a wide variety of phono preamps. Uses an improved engine, which provides an increased output of 5.5mV Stylus type: Elliptical | Stylus tip radius r/R: 8/18 m Professional installation encouraged