Blue Wink Panda Pocket Warmer100% PolyesterHeight 1.5 cm - Diameter 10 cmManual :1. Fold the metal plate contained in the bag once or twice so that the liquid crystallizes.2. The hand warmer heats up to 50 ° C up to 55 ° C and cools down for one hour depending on the outside temperature. You can extend the heat for about half an hour by kneading the bag from time to time.3. Before next use please put the hand warmer in boiling water for about 8 minutes until the crystals are liquid again.Safety Tips: This is not a toy, keep it out of the reach of children! / Never use the hand warmer directly after boiling it! / Do not put in the microwave!