Spare parts kit for 3M Littmann Stethoscopes, Classic III, Cardiology IV, and Core, black, 400163M Littmann Stethoscope Spare parts kit Classic III Cardiology IV and Core black 40016 The Spare Parts Kit for 3M Littmann Stethoscopes is essential for any healthcare professional who depends on their stethoscope for accurate and reliable results. This kit is compatible with the Classic III, Cardiology IV, and Core stethoscopes and includes a black rim and floating diaphragm for the chest piece. The black rim and floating diaphragm in this kit are