Police K9 Drink Coasters featuring a K9 design. Great K9 gift for a Police K9 Handler, Police Officer, or fans of Police K9’s. These 3.5″ x 3.5″ square rubber coasters are made of a durable heat-resistant polyester fabric top, backed with a neoprene rubber non-slip backing, keeps things from sliding. The rubber coaster is 1/8″ thick. It will not discolor or fade, machine washable.