Combination adult chestpiece precisely machined to exacting tolerances from lightweight aluminum is remarkably durable, yet extraordinarily comfortable. Extra large 1 3/8″ diameter bell. High sensitivity 1 3/4″ diaphragm. Non-chill bell and diaphragm retaining rim for patient comfort. Double leaf internal spring binaurals are fixed at 15° angle for greater comfort. Custom molded 22″ PVC tubing. ADSOFT™ PVC eartips and spare diaphragm included. Weighs 3.5 oz. Overall length 31″. Five year quality performance guarantee. Latex free.