Littmann Classic II known as the standard in the industry this performance stethoscope features the tunable diaphragm that allows both low and high frequency sound to be heard by simply alternating the pressure on the chest piece. The Classic II pediatric stethoscopes feature the patented floating diaphragm technology. All models feature single-lumen tubing no chill rim patented Littmann soft-sealing ear tips. Classic II pediatric style stethoscopes are optimally sized to facilitate sound sources in smaller patients.