3M™ Littmann® Stethoscope Spare Parts Kit for the Classic III™ or Cardiology IV™ Stethoscope contains a single piece tunable diaphragm for both the adult and pediatric sides of the chestpiece, a non-chill bell sleeva and two small (1/2 inch), Snap Tight Soft-Sealing Eartips. Tunable diaphragm technology-a 3M invention-lets clinicians hear different frequency sounds by simply adjusting the pressure on the chestpiece. Hold the chestpiece with light pressure to hear low frequency sounds; press a little more to hear higher frequency sounds. This time-saving feature allows the healthcare provider to focus on both adult and pediatric patients. Snap-tight, soft-sealing eartips conform to individual ears for an excellent acoustic seal and comfortable fit. Eartips snap firmly onto the ends of the eartubes and, for safety, require a significant effort to remove.