These Aqua Pearls hot cold packs are manufactured by the same manufacturer that make peas from CVS Pharmacy or TheraPearl from Walgreens. These can be heated or frozen to relieve pain, aches, or swelling. They conform to your body. Safety tested and FDA approved. These hot and cold packs are resuable, non-toxic, microwave-safe, & freezer-safe. These promotional hot/cold packs are available in multiple colors and shapes and printed with your custom logo.