These hollow mug coasters are made from high-quality silicone. Great for granite and quartz counte rtops, wood kitchen, and dining tables. They are heat-resistant, non-slip hot pads and are designed to protect your surfaces and hands, rest assured that durable and not easy to deform, and no deformation for long-term use. Simply wipe or rinse off these stains. The hexagon design helps you to store it, or it can be easily hung on the wall.