These molds are used to create tiles for basing and terrain. Simply put the mold sheet on top of the backer and place air-drying clay on top. Press the clay into the cavities of the mold and scrape the excess from the top with the scraper. Once dry the clay pieces pop out and can be used for accenting, model bases, dioramas, and terrain. We recommend “Prang DAS” air-drying clay with this product which can be found in many art stores and on Amazon.