Volcanic Lava Pumice Stone with Cord, Black

A natural black volcanic pumice stone, drilled through and threaded with cotton cord. Use wet to remove callouses and hardened dry skin. Pumice is formed by the sudden depressurisation of super-heated lava, usually during the more violent phases of volcanic eruptions, rapidly cooling as trapped gasses inside expand the lava petrifies into a remarkably light and sponge like form. Stones of very approximately 6cm diameter.