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.