28 Inch Black Classic II Pediatric Stethoscope Acoustics: Littman Classic II pediatric stethoscopes are optimally sized for infants and smaller children. Small sized diaphragms conform to the contours of pediatric and infant bodies. The pediatric stethoscope features a 1-inch bell and the infant stethoscope has a 3/4-inch bell for an easier chest wall seal. Comfort: These precision stethoscopes are designed to maximize the comfort of both patient and professional. No need to warm them up: a non-chill rim is on both the diaphragm and bell. Also this stethoscope has Littmann "Soft-sealing" eartips for an excellent acoustical seal in the ear canal and maximum comfort. Durability: As with all Littmann Classic II stethoscopes, the pediatric and infant models are designed for long-lasting durability. The snap-on tough elastomer polyurethane rims won't rust or corrode. Unlike threaded rims,these stethoscope rims won't come loose or fall off. The crack-resistant, reinforced yoke lets you fold the stethoscope easily into your pocket without kinking or breaking. The internal double-leaf binaural spring helps assure a long life and allows easy adjustment of eartube tension. The lightweight eartubes are durable and abrasion-resistant. Warranty: The Classic II Pediatric and Infant stethoscopes are backed by a three year warranty and a lifetime service and repair policy. The warranty is provided by 3M Health Care.