Two-sided models with traditional bell/diaphragm chestpieces are designed, sized and acoustically precise for children and infants. The Littmann Classic II Pediatric stethoscope features a 1-inch traditional bell combined with a floating diaphragm. The Littmann Classic II Infant stethoscope features a 3/4-inch bell with a floating diaphragm. Both stethoscopes feature a solid stainless steel chestpiece for high acoustic sensitivity. 28 inch (71,1cm) Classic II Pediatric Stethoscope.