The MDF® Acoustica™ Stethoscope is a lightweight diagnostic instrument that delivers accurate auscultation of heart, lung, and Korotkoff sounds with acoustic integrity and clarity. An ergonomic design ensures comfort for the doctor and patient, even during extended use. Precisely handcrafted from premium aluminum, the Acoustica™ Stethoscope is the ultimate in auditory diagnostics with unmatched performance and durability.The super-duty, lightweight aluminum dual-head chestpiece is precisely machined and hand polished for the highest performance and durability. Full-rotation acoustic valve stem with green indicator dot allows the user to easily identify the active sound channel. The chestpiece is fitted with an ultrasensitive diaphragm sealed with a non-chill retaining ring to provide a secure acoustic transmission. The large bell, crowned with a non-chill bell ring, provides greater sound amplification, isolation of low frequencies, and patient comfort.Extra set ComfortSeal™ eartips, spare ultrasensitive diaphragm, and ID tag.