Concrete Coasters for Coffee TableThis coaster set of 4 or 2 will add a mid century modern touch while protecting surfaces around your home or office. They are sealed to prevent staining, simply wipe off any stains. Size: 4" x 4" x . 5" Materials: These are handmade with concrete, and an eco friendly sealer, and a cork back. Care: Items are sealed and splash resistant but to clean would advise lightly wiping with a damp cloth and avoid bleach. Remove any spills to avoid staining. Our