We offer foam sign letters in high density polystyrene for temporary or fast indoor applications and Corafoam letters for durable outdoor applications.Polystyrene is like Styrofoam letters without the brand name price. Corafoam letters are made from a high density foam that is impervious to moisture, rot, and bugs. These are fantastic materials because they are extremely lightweight and come in thick panels to make large sign letters without the bulk. Large foam letters demand attention and small foam letters are great for indoor applications making foam letters signs the "go-to" product for versatility. Face these foam letters with acrylic or metal and get thick colorful letters that make an impact..