Silver dual head chestpiece for cardiology diagnose, the membrane with diameter 48mm is sensitive for sound collecting. The small deep cone-shape chestpiece is used for auscultating of cacophony, or slight and low frequency sound. Stainless steel chestpiece, excellent sound conduction. Considerate dual anti-chill ring design. 'A' shape tube ensures the best sound conduction. Connecting spring is embedded, ear tip is specially designed for suiting the ear structure. Thick tube is with excellent resistance to ambient interference. Including: A pair of Metal ear tip, a pair of soft ear tip and a replaceable membrane.