Our most popular product: PUZZLE coasters are made of surplus ceramic tile. The package includes four pieces. Can be used as coasters, candle holders or pot holders. When puzzle pieces are divided into two, they can be used under a bigger casserole or when divided into four they can be used under a baking tray, in all four corners. Coasters can be cooled in the freezer to keep food and drinks cold. Silicone buttons on the bottom, so countertops won’t be harmed. Shades of grey may vary.