C Major Chord Tuning Fork Set on Resonance Boxes

Set of four removable tuning forks for demonstrating a C major chord, supplied on resonance boxes made of straight-grained pine. A soft striking hammer U10122 is included. Frequencies and internal lengths are c′ 256 Hz/300 mm, e′ 322 Hz/240 mm, g′ 384 Hz/190 mm and c″ 512 Hz/140 mm.