Each coasters measures 4x4 inches & is made of tumbled marble. The edges have a roughed up, rustic look & with the texture of the tumbled stone, no two coasters are the same! A layer of lacquer is applied to the top to protect the design while a piece of cork is applied to the bottom to keep your surfaces safe. All sets come with 4 coasters. These make a great gift & are a fun addition to your home dcor! Thank you Hero Arts! Because no two stone tiles are the same no two coasters are the same. It gives each coaster their own special character :) Winter Coasters ~ Season Decor Farmhouse Housewarming Gift Coasters~ Marble Christmas