Thirteen tuning forks with the following frequencies marked on each fork:
C (256Hz),
C1 (271Hz),
D (288Hz),
D1 (302Hz),
E (320Hz),
F (341.3Hz),
F1 (362Hz),
G (384Hz),
G1 (405Hz),
A (426.6Hz),
A1 (455Hz),
G (480Hz) and C (512Hz).

Made from chromium plated steel each electronically tuned. Prong length approx. 90mm. Packed in velvet lined storage box.