Summer Fields Wildflowers Square Assorted Tumbled Stone Coaster Set of 4, Highland Graphics Assorted 4-coaster set - a different image/design on each one. Made in the U.S.A. Each tumbled stone coaster is an approximate 3.625" square x 0.3" thick. Tumbled edge adds elegance and charm. Coasters are cork backed to protect your furniture and works well with either hot or cold beverages Cleans easily with mild liquid detergent and water. Rinse & air dry.