Tytan421 Medical Professional series Stainless Steel Adult Stethoscope ? Features * Chestpiece The solid stainless steel chestpiece for both 1-3/4 inch DIA. diaphragm and 1-1/4 inch DIA. bell for excellent acoustic sensitivity. * Binaural Stainless steel binaural tube with a reinforce dual inner-spring construction provides extra durability, while still maintaining portability. * Tubing Special 22 inch Y type thick-walled tubing with internal 3-way sound transmission connector provides outstanding sound transmission. * The eartubes are permanently set at anatomically correct angle for better sound transmitting into your ear canals. Plus, the soft screw-on soft eartips that assures maximum comfort and excellent acoustic seal in the ear canal. An extra diaphragm with pair of small soft screw-on and firm eartips are also provided. * Packed in a deluxe molded foam gift box.