Silver dual head chestpiece for adult, the membrane with diameter 48mm is sensitive for sound collecting. The small bell-like chestpiece is used for auscultating of slight and low frequency sound. Considerate dual anti-chill ring design. Connecting spring is embedded, ear tip is specially designed for suiting the ear structure. Stainless steel chestpiece, excellent sound conduction. Including: A pair of Metal ear-tip and a replaceable membrane.