Constructed from premium-grade acoustically-superior stainless steel, the MDF Classic Cardiology Stethoscope 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. The Classic Cardiology is the ultimate diagnostic instrument with unmatched performance, durability, and aesthetics. With its extra-deep cone-shaped bell and ultrasensitive diaphragm, this cardiology stethoscope detects the entire frequency range required by cardiologists. Chestpiece: The handcrafted stainless steel 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 for heart and lung sounds of 100Hz to 1000Hz. The extra-large cone-shaped bell, crowned with a non-chill bell ring, provides greater sound amplification, isolation of low frequencies (20Hz to100 Hz), and patient comfort. Acoustic Tubing: Constructed of thicker, denser, latex-free PVC, the dual lumen non-stick acoustic tubing ensures sound efficiency, provides insulation for superior sound transmission, and seals out ambient noise while preventing the cracking and wearing that can occur from repeated use. The longer-than-average length allows a comfortable space between health professional and patient. ErgonoMax Headset: Hand polished, pre-angled stainless steel binaural features a patented internal dual-leaf spring construction for durability and custom fit. Soft ComfortSeal eartips are clear for hygienic purposes and conform to the ear to seal out extraneous noise while ensuring comfort during extended use. Force-fit, non-threaded SafetyLock eartip adaptors lead the industry in user safety. Included Accessories: 2 extra sets ComfortSeal eartips, spare ultrasensitive diaphragm, and ID tag. Warranty and Service: Lifetime warranty (5 years on tubing); Free Replacement Parts for Life Program.