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KOKUBO Hand Warmer Bag (Large) generates heat naturally after you have opened the packing and gently shaken the inner bag. If it is put inside pocket, the temperature will rise again.
The highest temperature generated is 67℃, whereas the average temperature is 53℃. It maintains a temperature of over 40℃ for 18 hours.
Size: 13.2 cm × 10 cm
Tear open the plastic bag. Shake the inner bag for a while (do not puncture it) for heat generation.