Rough Bark Texture Mat 5.5 x 5.5 x .2 Blue When this texture mat is pressed into clay, the texture / pattern will be raised (stick out) of the surface of the sheet of clay. It can be used for polymer clay, metal clay and more. This flexible urethane texture mat is for use with polymer clay, metal clay, etc. and can take temperatures up to 150 F. NOT FOR FOOD.