The tuning forks are made of chrome steel, with different lengths and sections of 5.5 x 8.5mm.
Hz frequencies : 261.6, 293.6, 329.6, 349.6, 392.0, 440.0, 493.9 and 523.2.
Error ±0.2% at a temperature of 20°C.
With case and hammer. Suitable for demonstrating the tones-frequencies relationship, and for tuning music instruments.