Absorbastone Coasters ~ Fire Station AbsorbaStone Drink Coasters ~ The Best There Is! Each tumbled stone coaster is an approximate 3.67" x 3.67" square x 0.3" thick. Tumbled edge adds elegance and charm. Coasters are cork backed to protect your furniture & works well with either hot or cold beverages Cleans easily with mild liquid detergent and water. Rinse & air dry.