Erkaphon 547 Stethoscope – Precision You Can Trust For Medical Excellence. FEATURES: ‣ The stainless steel chest piece ensures outstanding durability. ‣ Soft silicone ear tips are ergonomically designed to fit comfortably. ‣ The advanced dual-channel tube design prevents rubbing noise so that you hear physiological sounds more clearly. ‣ This stethoscope comes equipped with a non-chill diaphragm for patient comfort.