1 New Natural Volcanic Stone Foot Care Theraphy, Removes Dead Skin Built Up From Feet! Are these really from volcanos? Yes! These stones are formed by volcano eruptions. Pumice formed from the lava that is full of gas. The lava is ejected and shot through the air during a volcano eruption. As the lava hurtles through the air it cools and the gases escape leaving the rock full of holes. These holes create a texture that is ideal for light, safe and natural abrasion May naturally vary in size and shape Volcanic stones have been rounded so they comfortably conform your feet These volcanic pumice stones will wear away rough dead skin build uo from you feet.