The 3M™ Littmann® Cardiology IV™ Diagnostic Stethoscope's distinctive, chalice-shaped chestpiece delivers outstanding acoustic performance, diagnostic versatility, and convenience for treating adult and pediatric patients. Both sides of the chest piece have single-piece diaphragms that are easy to remove and clean, while the pediatric side of the chest piece easily converts to a traditional open bell by removing the tunable diaphragm and replacing it with the included non-chill bell sleeve. Listen to, identify, and diagnose even the most subtle body sounds through the power of tunable diaphragm technology. Dual-lumen tubing combines two sounds paths in one tube, eliminating the rubbing noise that traditional double tubes create.