The Littmann Classic II Pediatric Stethoscope features a 1-inch traditional bell combined with a patented floating diaphragm. The Littmann Classic II Infant stethoscope features a 3/4-inch bell with a patented floating diaphragm. Both stethoscopes feature a solid stainless steel chestpiece for superior sound quality. Benefits: One-inch traditional bell (pediatric) and 3/4 inch bell (infant) combined with a patented floating diaphragm. Stainless steel chestpiece. Excellent acoustic seal and comfortable fit with patented 3M™ Littmann® Snap Tight soft-sealing eartips. Comfortably angled, anatomically correct headset. Single-lumen tubing is available in attractive colors. Three-year warranty.