Lightweight aluminum chestpiece construction. Non-chill diaphragm rim and bell ring for patient comfort. Proprietary diaphragm enhances acoustic response by 50% over traditional designs. Adjustable aluminum binaurals with PVC eartips. Flexible 22"" PVC tubing. Combination diaphragm/bell chestpiece for wide frequency response. Diaphragm diameter 1 3/4"", bell diameter 3/4". Spare pair of black mushroom eartips included