Weighted 256 Hz Tuning Fork Free Shipping! C=256 Hz Verdi Tuning Fork Weighted, calibrated to the scientific pitch Engraved "C 256 " Aluminum, non-rusting, non-tarnishing, 2 pronged, Weighs 2.3 oz, 6.75 inches long, 7/8ths inch height, Plastic wrapping, carry pouch For medical offices, music, neurology, healing, sound therapists, physics labs, science class sound experiments Fast shipping, best quality, will last for many years with proper care