The Harvey DLX Stethoscope is our most prestigious and durable model with dual-lumen PVC tubing, brass chestpieces and binaurals, and triple-leaf binaural springs. Optimized for listening to higher frequency and critically important sounds like murmurs, clicks, and ejection sounds. Provides clear transmission of the first and second heart sounds. Ideally sized bell bridges intercostal space between the ribs. Tightly constrained diaphragm provides superior response at large frequencies. Additional corrugated diaphragm for detecting mid-range and low frequencies.- Harvey Deluxe Triple Head Stethoscope, Black, 28" (US Only)