Tuning forks made predominantly from the most abundant element in the earth's crust. Aluminum - atomic number 13.

Standard alloy tuning fork, 4096 Hz. Made in the USA.
Standard alloy tuning fork, 512 Hz. Made in the USA.
Standard alloy tuning fork, 64 Hz. Made in the USA.
Aluminum alloy tuning forks. Made in the USA.
Premium aluminum alloy tuning forks. Made in Germany.