Cultured marble, a type of solid surface, is made from a mix of high strength polyester resin and natural marble stone dust that is cast or formed in a variety of standard and custom molds to make bathtubs, whirlpool decks, shower pans and wet walls, windowsills, ADA compliant bathroom fixtures, and vanity tops with a surface that resembles marble. Though it is a less expensive alternative to real marble, it has 4 times the strength of natural stone.