Smooth-On, Inc. makes liquid mold-making and casting materials that turn designs into three-dimensional parts, props, architectural details and sculpture. Based in Macungie, Pennsylvania, the company is especially known for rubber molds used in concrete casting, while its materials also appear in film, special effects and industrial prototyping. Smooth-On produces millions of pounds of material each year and supports users with technical guidance, how-to instruction and training seminars.