Threaded Chestpiece Drum Of Chrome Plated Zinc Permits The Use Of Five Interchangeable Chestpiece Fittings - An Adult And Pediatric Diaphragm And Three Bells (11/4 1 3/4 ) - For Complete Diagnostic Capability In Most Patients * Latex-free Double Tube Configuration * Proprietary Valve Mechanism Eliminates Acoustic Leakage * Adjustable Aluminum Binaurals * Complete With An Accessory Pouch Containing The Bell Chestpieces Chestpiece Key 2 Spare Diaphragms And One Pair Of Silicon Eartips * Inspected And Packaged In The U.s.a. * Traditional 16 Double Tube Configuration * Weighs 7 Oz. * Overall Length 24 * One Year Warranty *