Quality and reliability in one convienient package. Contains one tunable diaghragm and rim assembly for the adult side of the stethoscope chestpiece, Black. Contains one tunable diaghragm and rim for the pediatric side of the stethoscope chestpiece, Black 3M Littmann Stethoscopes offers the high quality that medical professionals expect, and each replacement part and accessory meets the same demanding standards. Conveniently packaged in kits that correspond to our stethoscope models, Littmann stethoscope replacement parts and accessories make repairs simple. Each item is carefully manufactured to work seamlessly with existing equipment.