The product is used in auscultation body organs such as heart and lung activity with sound change、 comply with the requirement of modern medicine.<br /> <br />this stethoscope advantages are as follows:<br />1.our ears hang for copper material、 durable.The aluminum is brittle crack easily.<br />2.we stethoscope shrapnel is 5 mm in diameter、 ears hang good balance.Than 4 mm、 easily around and uneven.<br />3.we head diaphragm for imported fiber production said \