Our pumice stones come from Mt. Shasta in California, where pumice was formed when frothy, gaseous lava mixed with water and caused it to harden. The result is an extremely porous and abrasive stone, ideal for scrubbing away callouses and dead skin. Our pumice stones measure approximately 3.5" x 3.5" x 2" and weigh between 3.0 - 3.9 oz.