Tube, 28 inch The Littmann Classic II Infant stethoscope features a 3/4-inch bell with a floating diaphragm. Stethoscopes feature a solid stainless steel chestpiece for high acoustic sensitivity Features: 3/4 inch bell (infant) combined with a 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. Specifications: Used as a diagnostic aid as part of the physical assessment of an infant or pediatric patient.