Pumice stones are a natural beauty tool made from mixing lava with water and forming it into a light, yet abrasive, stone. While your skin is moist, either in or right after a shower or bath, rub the stone on feet, knees, and elbows to remove calluses and rough spots leaving smoother skin. When finished, apply an oil or moisturizer. Each stone measures approx. 4" L x 3 1/2" W x 1 1/2" H. 1 1/2" loop for hanging. After use, run under warm water and hang dry. Lava stones are sold individually.