McKesson LUMEON™ Sprague Stethoscope Lavender 2-Tube 22 Inch Tube Double Sided Chestpiece (363731_EA) 1/EAAdjustable chrome plated binaurals for a comfortable fit Complete with an eight piece accessory kit Gasket sealed system for improved acoustics Patented valve mechanism virtually eliminates acoustic leakage Chest piece key facilitates diaphragm replacement 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) Weighs 6 oz Double tube