Additional Details ------------------------------ Product description: Keep your tables and surfaces from being damaged by perspiration, water rings, stains, and scratches with these black coasters for coffee table. Each slate stone coaster features soft pads on the bottom so to prevent accidental scratches. They can be easily cleaned by using a soft wet cloth. Please note that these black coasters should not be used in the dishwasher. Each set comes with 8 round coasters and a convenient black metal holder.