Silicone moulds can only be used for oven, microwave ovens, and dishwashers and refrigerators. DO not use in gas and fire.Do not use knives or other sharp tolls on silicone moulds and avoid stress, pull.The mould may be stored quite a while and has been pressed down, and shapes changed. Please place it under the sun or place in oven or place in a high temperature. The shape then will be restored.-Question: I have used this product 3 times and few "dimples" are already starting to tear away from the base.-Answer: The mould may be stored quite a while and has been pressed down, and shapes changed. Please place it under the sun or place in oven or place in a high temperature. The shape then will be restored.. -Question: Please let me know the temperature of the mould can suffer.-Answer: In general practice, can suffer within the temperature between -40~220 centigrade, in some case can suffer 260 centigrade. Please note silicone mould, which can suffer temperature higher than 260 centigrade (500 degrees fahrenheit) or temperature lower than -40 centigrade (-40 degrees fahrenheit), may be additive, is not 100% pure silicone.. -Question: Why the mould soft a bit?-Answer: For flexible reason, we design the mould a bit soft, so you may easily un-mould.