ITEM NAME:1PC Natural Pumice Stone Pumice Stones Foot Stones Clean Exfoliating Scrub Ca Cy note:.Soak in boiling water for 2-3 minutes. Hot water soak for 15-20 minutes, use pumice to gently rub the soles of the feet for a few minutes, and the horny will fall off. Typeï ¼Å¡ pumice stone. It can effectively remove feet toe and dead skin & stain.