Set of four tuning forks for demonstrating C-major chord. Supplied on a sound box made of clear grained pine for especially long sustain from which the tuning forks can be removed. Includes a soft striking hammer (U10122).

Natural frequency, Internal length:
• c’ = 256 Hz 300 mm
• e’ = 322 Hz 240 mm
• g’ = 384 Hz 190 mm
• c’’ = 512 Hz 140 mm