... tubing for sound transmission;plastic earpieces2.Function:The stethoscope is a mechanical device used to project the sounds associated with the ... ,e.g.,of respiratory system or other syetem.it is a conventional medical device with very low risk:non-invasive,non ... preponderates over 80%...... Form of packing :One machine in a color box,and every 50 color boxes in one export carton stethoscope ...