All natural, pain relief on contact. No drugs. No toxins. No smell. No batteries. No cords. Kailo Patch has patented technology of all natural elements with microscopic particles of copper, silver, and silicon that are arranged in a special way that is efficient at absorbing your body's energy. Place along your body's pain pathways so the Kailo technology can provide you with relief to pain and discomfort. Kailo FLEX is the more flexible, shorter life version of our best selling Kailo Pain Patch.