McKesson Lumeon Sprague Rappaport Stethoscope features a convertible chestpiece, patented valve mechanism, gasket-sealed system, and double-tube configuration in 22 inch length. – Convertible chest piece permits the use of five interchangeable chest piece fittings — an adult and pediatric diaphragm, and three bells (1-1/4 inch, 1 inch, 3/4 inch). Patented valve mechanism virtually eliminates acoustic leakage. Chest piece key facilitates diaphragm replacement. Gasket-sealed system for improved acoustics. Double-tube configuration in 22 inch length for improved acoustic separation. Adjustable chrome-plated binaurals. Complete with an eight-piece accessory kit. Weighs 6 oz.