Measuring 4" x 4", these rainbow gel bead packs can provide both hot and cold therapy care for those in need. Each one is filled with gel peas that mold to your body with ease. Totally reusable, simply microwave for hot therapy, or freeze for cold (detailed instructions are printed on back). They are perfect promotional item for hospitals, doctor's offices, health fairs, or spas. Packs should not be used on infants. This product is not intended for use by children or pets. It may present a choking hazard to children under 3 years of age.