QTY Per Sell: 1 Threaded chest piece drum of chrome plated zinc permits the use of five interchangeable chest piece fittings - an adult and pediatric diaphragm, and three bells (11/4", 1", 3/4") - for complete diagnostic capability in most patients Double-tube configuration in 16 inch length Proprietary valve mechanism eliminates acoustic leakage Adjustable chrome-plated brass binaurals Complete with an accessory pouch containing the bell chest pieces, chest piece key, two spare diaphragms, one pair of mushroom ear tips, and one pair of silicon ear tips Weighs 7 oz Overall length 24 inches 1-year warranty WARNING: This product can expose you to di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.:California Warning: Yes