Set of 2.
To activate: find the round metal disc and firmly flex. The gel will turn white and rapidly heat up.
To reactivate: once the product has cooled down and hardened, cover it with a cloth and submerge in a pan of cold water. Bring to the boil and simmer for around 5 minutes until the gel becomes clear. Allow the water to cool before removing the product. Before reactivating make sure the product is cold.
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