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THIS UNIQUE HAND WARMER IS REFERRED TO AS "CRYSTALLIZATION TYPE" BECAUSE IT IS ACTIVATED BY FLEXING A SMALL METAL DISK INSIDE THE HAND WARMER THAT WILL PRODUCT HEAT. WILL STAY WARM FOR 15-25 MINUTES. SIMPLY IMMERSE IN VERY HOT WATER UNTIL CONTENTS BECOME FLUID AND ALLOW TO COOL. CAN BE USED UP TO 300 TIMES. INSTRUCTIONS ARE PRINTED ON ITEMS. COMPLIES WITH FDA. 3 7/8" L X 3 7/8" W X 1/2" H
