slate

Fashion design: These 100% all natural slate coasters fitting any color of dark tables and suits any kitchen theme, can make your home decoration full of personality
Table Safe: The square slate stone have a sturdy surface that can anti scratch and easy to clean, the bottom of the coaster have non-slip round mini soft mat provides stability.
Perfect Size: Standard square size, 4 x 4 inch. When used as a coaster, it fits most cup sizes, such as coffee mugs, beer glasses, and wine glasses.