Constructed from premium-grade stainless steel, MDF 22K Classic Cardiology Stethoscope is one of the finest in auditory diagnostics available for medical professionals. The Classic Cardiology Stethoscope provides accurate auscultation of heart, lung and blood pressure tones and ergonomically designed components provide extended usage comfort. Chestpiece: The Dual-Head chestpiece and full-rotational Acoustic Valve Stem are machined and polished to the exact tolerance from the finest stainless steel. The Diaphragm is fitted with an ultra-sensitive Diaphragm sealed by the Diaphragm Retaining Ring to produce optimum amplification and high frequency transmission of heart and lung sounds at 100 to 1000Hz. The extra large and deep cone-shaped Bell detects acoustic sensitivity at low frequency sound transmission at 20-100 Hz. Diaphragm and Bell are crowned with a non-chill durable PVC Diaphragm Retaining Ring and Bell Ring to provide greater patient comfort. Ergonomax Headset: Polished stainless steel headset provides superior acoustic transmission. Enclosed double internal spring and MDF ComfortSeal Eartips are ergonomically designed for long lasting fit and comfort. Acoustic Tubing: Combined dual acoustic tubes with enlarged internal acoustic pathway in the Y configuration sustains the superiority of double tube acoustic transmission and eliminates internal acoustic leakage and external interference. Acoustic Tubes are constructed of non-cracking, non-sticking high-density latex-free PVC. Accessories: Additional (2) ComfortSeal Eartips, (1) ultra-sensitive Diaphragm and (1) ID tag.