Handcrafted Since 1971 Latex Free. The MDF Instruments acoustical stethoscope is a lightweight diagnostic instrument that delivers accurate auscultation of heart, lung, and Knockoff 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 acoustical stethoscope is the ultimate in auditory diagnostics with unmatched performance and durability. The super-duty, lightweight aluminum dual-head chest piece is precisely machined and hand polished for the highest performance and durability. Full-rotation acoustic valve stems with a green indicator dot allow the user to easily identify the active sound channel. The large bell, crowned with a non-chill bell ring, provides greater sound amplification, isolation of low frequencies, and patient comfort. Constructed of thicker, denser, latex-free PVC, the Y-configuration non-stick acoustic tubing provides insulation for superior sound transmission and seals out ambient noise while preventing cracking and wearing that can occur from repeated use. The longer-than-average length allows a comfortable space between health professionals and patients. A patented internal metal-alloy chamber located in the acoustic tubing below the spring keeps the tubing channel open for maximum sound transmission into the headset. Hand polished, the pre-angled chrome-plated brass headset features a patented internal dual-leaf spring construction for durability and custom fit. Soft silicone Comfort-seal™ ear-tips (available in standard and small sizes) are clear for hygienic purposes and conform to the ear to seal out extraneous noise while ensuring comfort during extended use.