Pediatric Chestpiece:Lightweight pediatirc Diaphragm and pediatric Bell Chestpiece and full rotation Acoustic Valve Stem are constructed of anodized aluminum and chrome-plated brass, respectively. The pediatric Bell side detects low frequency sounds with built-in, non-chill Bell Insert Ring for patient comfort. The pediatric Diaphragm side is fitted with an Ultra-Thin Fiber Diaphragm for detecting high frequency sounds. Combined, the pediatric Dual Head Chestpiece enables users to hear a wide range of pediatric cardiovascular and respiratory acoustic frequencies.