With the Sandtastik 10 lb. Activa Model N" Mold, you can build a fantasmic castle and then go ahead and dig it a moat that truly holds water. This mold is non-toxic and totally reusable, making it perfect for fun in the sun, fast dimensional studies, or as an introductory carving material. Available in blue, red, white, or yellow. Moldable sand for all sourts of projects. Great for sand castles and moats - holds water!. Non-toxic and completely reusable. Great introductory carving material. 10-pound bag. Available in blue, red, white, and yellow.