My guess would be aluminum oxide, the standard manmade grinding stone compound.
Tormek originally used natural grinding wheels mined on an island off the coast of Sweden. As I recall, it was Gotland Island.
The aluminum oxise wheels are coarser.
Ken
Tormek originally used natural grinding wheels mined on an island off the coast of Sweden. As I recall, it was Gotland Island.
The aluminum oxise wheels are coarser.
Ken

