Abstract: An earpiece for insertion in an ear canal as a part of an earphone, an ear mounted microphone, an earphone/microphone combination or the like. The earpiece comprises a body part suitable for housing an earphone transducer and/or a solid vibration pickup, and a canal insert joined to the body part. Having a generally elongate shape, the canal insert has a rear portion joined directly to the body part, a front portion away from the body part, and a midportion through which the rear and the front portions are joined together. The front portion and midportion of the canal insert have their cross sectional dimensions determined in a predefined relationship to fit as closely as feasible in the ear canals of a majority of people. The earpiece may be provided with a stabilizer, as in the form of a contact piece or pieces projecting laterally therefrom, for greater stability against dislodgement from the ear canal or rotational displacement therein.