Reusable Heavy Duty Cold Pack Round 10 Black Urethane Hot and or Cold Therapy Wraps Integrates tee valve and corrugated 17170 Integrates tee valve and corrugated tubing as they melt Provides up to 30 minutes of cold therapy * Clay inside urethane outside *Institutional grade packs are made of durable heavy duty urethane exterior which can be chilled to a lower temperature than other packs and a bentonite clay interior * Chilled pack should be wrapped in towel before applying to treatment area * Notice to California Consumers: WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm *