3M Littmann 2138 Classic II Teaching Stethoscope 40-Inch Chestpiece Black Burgandy TubeHigh acoustic sensitivity in a dual sided chest piece combines with durable, compact design to deliver versatile auscultation and rugged dependability Tunable diaphragm responds with a simple pressure change to capture low and high frequency sounds without the need to turn over the chest piece Anatomically designed headset is angled to meet the path of the ear canal and provide optimal listening Latex free materials for allergy sensitive users Non