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MDF Deluxe Dual-Head Stethoscope is modified Dual-Head that resembles the performance of the MDF Stainless Steel Dual-Head, MDF747XP. The Bowles and deep cone-shaped Bell with full-rotation Acoustic Valve Stem and enclosed Headset Spring provide sensitive acoustics and professional performance at an affordable price. Chest piece: Lightweight Dual-Head Chest piece and Acoustic Valve Stem are constructed of aluminum and brass, respectively. The Diaphragm side is fitted with an Ultra-Thin Fiber Diaphragm and sealed by the Diaphragm Retaining Ring to produce optimum amplification and high frequency sound transmission of heart and lungs. The deep cone-shaped Bell detects acoustic sensitivity at low frequency sound transmission at 20-100 Hz. Both the Diaphragm and Bell are crowned with non-chill durable PVC Diaphragm Retaining Ring and Bell Ring to provide greater patient comfort. Accessories: Additional (2) Comfort Seal Ear tips, (1) ultra-sensitive Diaphragm and (1) ID tag.