Our Sprague Rappaport (641) stethoscope features an improved valve mechanism that virtually eliminates acoustic leakage and a chestpiece key to facilitate aftermarket service. Features: Threaded chestpiece drum of chrome plated zinc permits the use of 5 interchangeable chestpiece fittings - an adult and pediatric diaphragm, and three bells (1 1/4", 1", 3/4") for complete diagnostic capability in most patients. Proprietary valve stem virtually eliminates acoustic leakage. Latex-free, double tube configuration for improved acoustic separation. Adjustable chrome plated brass binaurals. Complete with an accessory pouch containing the bell chestpieces, chestpiece key (to facilitate diaphragm replacement), 2 spare diaphragms, one pair of mushroom eartips, and one pair of silicon eartips. Comprehensive owner's manual. Inspected and packaged in the U.S.A. Convenient 22" tubing length. Weighs 7.5 oz. Overall length 30". 5 Year Warranty. Black only.