Features: Combination adult chestpiece precisely machined to exacting tolerances from lightweight aluminum. Extra large 1 3/8" diameter bell. Highly sensitive 13/4" diaphragm. Non-chill bell and diaphragm retaining rim for patient comfort. Internal spring binaurals are fixed at a 15º angle. Custom molded 22" PVC tubing. Adsoft™ PVC eartips (large size) and spare diaphragm included. Weighs just 4.5 oz. Overall length 31". Five year limited warranty.