The 3M Littmann Classic II Infant Stethoscope is designed with two sides. It has high sound sensitivity for its use with infants. Its headset is designed anatomically. Its impressive quality is demonstrated by its seven on a scale of 1-10. Its fitted for comfort with its patented 3M Littman Snap-Tight Soft Sealing Eartips. The headset provides maximum sound transfer. The headset can reliably be flexed aroound one million times, demonstrating its durability. It has a traditional bell designed for lower frequencies. It measures at 3/4 inches. The other side contains a patented floating diaphragm to hear at higher frequencies.