Paperproducts Design Keep Calm. Coaster Set, Set of 4 Hardboard with cork back Set of 4 Gift boxed Perfect for parties or everyday use Coaster measure 4.13-inch square Cork based bottom with beautifully decorated surface Gift Packaged in a set of 4 coasters with acetate top Reusable with surface that can easily be sponged clean Perfect as a hostess or housewarming gift Coasters measure 413 inches square