Cura-Heat Back & Shoulder Pain air activated heat pack for targeted relief. Provides 24 hour relief. Contains 7 heat packs. Ideal to use anywhere as it is fragrance free, non-medicinal and with a thin discreet design. Just open the Cura Heat sachet and apply to clothing or underwear where the heat radiates through to the source of pain, increasing circulation, decreasing stiffness and relaxing sore muscles. This product should not be applied directly to the skin. Cura Heat Back and Shoulder Pain warms up gradually and reaches maximum heat within approximately 30 minutes. Ingredients: Iron, activated carbon and water. Directions: Open the Sachet by hand (do not cut) and remove the Cura Heat heat pack. Peel away the paper strip. Adhere to clothing over the pain area. Heat pack reaches maximum heat in 30 minutes.