ACTÍVA Model 'n Mold is natural sculpting sensory sand that is easy and fun to use, is waterproof and non-toxic. It is a special sand that is designed for creative use indoors or out, and is perfect for all ages. It can be used over and over again as it won't dry out!Children love this sensory sculpting sand for creative, screen-free playtime. Drive toy trucks though it, create magical fairy worlds, or build free-form sand castles! The possibilities are endless.For hobbyists, Model 'n Mold allows you to build incredible sand projects such as a castle and also the moat around the castle that can be filled with water! Create exciting landscapes and topographical maps, including rivers and lakes that hold water and that can survive being studied and re-formed as needed.And for artists, Model 'n Mold is perfect for fast dimensional studies and as an introductory carving material for all arts and craft projects. Each pack includes 3 lbs. of sand. Sold as 2 packs for a total of 6 lbs. of sand.