This set of 4 coasters are created on hard-core art board, with alcohol ink. Next, an image is stamped and heat embossed. The ink is then sealed, and then coated with resin. This resin is heat resistant up to 500 degrees, so is safe for both cold drinks and hot ones. Each coaster also has a cork backing, to keep your home surfaces safe & dry. Coasters measure 4″ each, hex shape. The unique ink design and heat embossed image in gold make these one of a kind for your home decor.