These natural lava stones are both porous and abrasive making them perfect for scrubbing rough skin on feet, heels, and elbows. Each pumice stone is unique with a slightly different size, shape, and color. How to Use: Soak feet in the shower or bath for a few minutes until the skin is soft. Wet stone and scrub rough areas for a few minutes with light pressure. If you're working on your feet, focus on heels, sides of your toes, and other areas where dry skin tends to build up. Moisturize your feet after use.