Handcrafted Since 1971 | Lifetime Warranty | Free-Parts-for-Life Program | Latex Free. The MDF Sprague-X Stethoscope the patented X-configuration tubing eliminates the rubbing of traditional Sprague Rappaport dual tubing that can cause acoustic interference, it is 5-in-1 stethoscopes for a full range of diagnostic applications and is traditionally trusted to detect faint heart sounds and murmurs. Users can assess adult, pediatric, and infant patients. Chestpiece: Made of zinc-alloy. Full-rotation dual-output acoustic valve stem with green indicator dot identifies the active sound channel. Tubing: Constructed of thicker, denser, latex-free extruded PVC. AccuFit Headset: Adjustable headset constructed from chrome-plated brass for individualized fit. Patented SafetyLock eartip adaptors lead the industry in user safety. Included Accessories: 2 extra sets ComfortSeal eartips, adult and pediatric clear PVC diaphragms, pediatric diaphragm assembly, pediatric bell, infant bell, and ID tag.