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Lightweight Dual Head Stethoscopes Lightweight aluminum combination diaphragm/bell chestpiece for wide frequency response. Non-chill 1-3/4" diaphragm and 3/4" bell. Adjustable, chrome-plated brass binaural with PVC ear tips. Flexible PVC tubing in Black and Blue. Overall length: 30", diaphragm diameter 1-3/4". Weight: 4 oz.