100% Pure and Natural Himalayan organic mineral salt. Deo Balls are a natural alternative to chemical deodorants. They are completely safe to use because they contain only non-toxic minerals and are exceedingly gentle on sensitive skin. Simply wet the stone and rub onto skin. Does not feel stick or greasy and will not stain clothes. Don't leave your stone in water or very damp conditions as this will cause the stone to dissolve. Will generally last 6 - 12 months, depending on use.