Set of 13 tuning forks designed to be used in science experiments. Made from the best quality nickel-plated steel, with plain shanks and frequency stamped on each. Frequencies in Hz: C (512), B (480), A (426-6), A (405), G (384), F (362), F (341-3), E (320), E (302), D (288), C (271), C (256), C (236). The set comes in a handsome wood carrying case with latches.