These items are great, but you need to have a good pad to keep the item for warping a lifetime table. We simply put a 1/4 piece of plywood on the table to prevent it from overheating--it worked like a charm. I had tried some silicone mats, but they were thick up to prevent the table from getting too warm. Everyone at our gathering wanted to know where we got them so they could purchase some for their upcoming gatherings. These were so much better than the traditional steam pans that we have used in the past---no worry about having a flame around the food table.