2 heavyweight chromed brass DUAL ( bell and diaphragm ) adult size stethoscope heads, each on a separate tube allow one head to be placed at 2 different points on the torso. Some diagnosticians insist this is the only way to hear some pulmonary abnormalities. Heavyweight chromed-brass binaurals. Ball-bearing flip-over mechanism for airtight high frequency sensitivity. Mushroom and regular earpieces. Non-chill ring on each bell for patient comfort. We can ship in a lightweight box but standard is a box giving a total weight of 11.2 ounces. If you are ordering some other things and would like this stethoscope left out of its box to save shipping cost, let us know by email. We will adjust shipping cost after you place your order.