Constructed from premium-grade stainless steel in 22K gold-plating, the MDF 22K MD One Stainless Steel Dual-Head Stethoscope is one of the most widely sought after professional-grade stethoscopes today. MDF777 provides accurate auscultation of heart, lung and blood pressure sounds as well as overall durability and aesthetics. Chestpiece: The deluxe adult stainless steel Dual-Head Chestpiece and full-rotation Acoustic Valve Stem are precisely machined for the highest performance and durability. The Diaphragm is fitted with ultra-sensitive Diaphragm sealed by the non-chill Diaphragm Retaining Ring to provide a secure acoustic transmission. The extra large Bell crowned with non-chill Bell Ring provides greater acoustical amplification, isolation of low frequency sounds and offers patient's comfort Ergonomax Headset: Machined and polished stainless steel tubes, enclosed internal spring and MDF ComfortSeal Eartips are designed for long lasting comfort and high performance acoustic transmission. Acoustic Tubing: Heavy-walled and internal acoustic pathway in the Y-configuration, the tubing is designed to maintain acoustic integrity. 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.