Using this cold muscle roller is easy. First, put the stainless - steel roller ball in the freezer until it's completely cold. Then, take it out and gently roll it over the sore muscles. You can apply a bit of pressure for better results. Be careful not to use it on broken skin or areas with cuts. After use, wipe the roller ball with a clean, dry cloth. Store it in a cool, dry place. Don't leave it in direct sunlight or high - temperature areas as it might affect its cooling ability.