Cardinal Health Instant Hot and Cold Packs, Large, 6″ x 9″ (15.2 x 22.8 cm), 2 Count (1 Hot and 1 Cold), Retail Only. Convenient, effective pain relief – 6 in. x 9 in. for use anytime, anywhere. Consistent hot or cold therapy up to 30 minutes as used in hospitals. Safe, therapeutic temperature that can be applied directly to skin. Activates instantly, no microwave or refrigeration required.