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.