3M™ Littmann® Stethoscope Spare Parts Kit for the Master Classic II Stethoscope contains a grey rim and tunable diaphragm/rim assembly in addition to 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.
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.