Stainless steel construction for rugged durability. Combination chestpiece precisely machined to exacting tolerances for outstanding acoustic performance. Extra deep bell for unsurpassed low frequency response. Non-chill bell and diaphragm ring for patient comfort. Custom molded 16” bi-lumen PVC tubing improves acoustic separation. Internal spring construction reduces bulk. Binaurals fixed at 15° angle for greater comfort. Includes one pair of plastic eartips and two pair of PVC eartips with threaded metal inserts for the ultimate in wearing comfort and acoustic seal. Weighs 9 oz. Overall length 25”. Latex free. Lifetime warranty.