These are nice big beads, 12mm, fits up to 7" wrist.
Shungite is a black stone, similar to coal. It is a unique natural formation, intermediate between amorphous carbon and graphite.
In a general sense, Shungite is a stone which in large part consists of finely-dispersed globular carbon in crystalline phase and a special form of carbon - fullerene. It is said Shungite possesses adsorption activity (the ability to absorb substances from the environment), bactericidal activity, high adhesion characteristics (the ability to communicate with any substances), RF shielding characteristics.