Natural Stone Beverage Scarecrow Coasters. Coasters have a cork backing to protect your furniture. These are not dishwasher safe & should be wiped off with a damp cloth for cleaning. They also have been sealed with an acrylic sealer to prevent any damage by condensation from your glass. Each coaster is unique due to the natural variations in each tile. Coasters measure 4" x 4" & are a set of four. Scarecrow Autumn Coasters For The Upcoming Holidays, Made Out Of 4" X Ceramic Stone Tiles