ThermoSafe U-tek 420 Phase Change Material Gel, -23&deg;C Temperature, 7.5" L x 6.5" W x 1" H (Case of 12) Reusable phase change refrigerant gel packs maintain cold temperatures longer than standard gel packs; rated water -23 degree c (-10 degrees f) Formulated for foods, medical products, and deep frozen protection for long periods of time, but cannot tolerate dry ice or Co2 Case of 12 packs; each individual pack measures 7.5 x 6.5 x 1 inches (lxwxh) Laminated, metallized film exterior provides radiant heat barrier and resists punctures Available in a variety of sizes and quantities