Adscope® 641 Sprague Stethoscope. Features: Threaded chest piece drum of chrome plated zinc permits the use of 5 interchangeable chest piece fittings - adult and pediatric diaphragms, and 3 bells; (1 1/4", 1", 3/4") - for complete diagnostic capability on most patients. Complete with an accessory pouch to hold the bell chest pieces, chest piece key, 2 spare diaphragms, one pr. of mushroom ear tips, and one pr. of silicon ear tips, Wt.7 oz., length 30". 5 Year Warranty from Adscope.