Combination adult size chestpiece precisely machined to exacting tolerances from surgical stainless steel for outstanding performance and rugged durability. Extra large bell (1 3/8 diameter) for unsurpassed low frequency response. Ultra sensitive diaphragm (1 7/8 diameter) for greater amplification and crisper high frequency response. Non-chill bell and diaphragm retaining rim for patient comfort. Stainless steel binaurals with double leaf internal spring fixed at 15° angle for greater comfort. Reinforcing yoke molded into flexible 22 PVC Y tubing. ADSOFT™ deluxe PVC eartips. Spare diaphragm and scope ID tag included. Weights 5.77 oz. Overall length 31. Lifetime quality performance guarantee. Latex free.