* Contains one replacement tunable single Chest piece diaphragm for the adult side of the stethoscope , Plus One tunable single piece diaphragm for the Pediatric side of the stethoscope and two Extra Ear Pieces * Diaphragm fits Classic 3 and Cardiology 4 Stethoscopes * Accessories kit Contains two Bonus Extra Ear Pieces * Fits all Brands: 3M Littmann, FriCARE, Ever Ready, MDF Instruments, Prestige For Doctors, Nurses, veterinarians * For Doctors, Nurses, veterinarians; Classic III and Cardiology IV