Established in 2005 in New York, NSI International sells children's toys and learning games. It's best known for Magic Rocks, Smithsonian Science Kits, and a number of crafts and activities kits. NSI International also created the classic toys Gak, Floam, and Slime. Among NSI ... Read More 's bestselling Smithsonian kits are the Mars Dig Kit, the Giant Volcano Kit, and the Telescope; Magic Rocks kits including Magic Rocks, Sea Monsters, and Magic Marbles; classic crafts including rock tumblers and wood-burning kits; and magic toys including Merlin's Magic. Additionally, NSI carries crafts and activities such as Imagine Nation Machines, Imagine Nation, EZ Pop, Twisted Tie Dye, StickUms, Beadrageous, Hot Stuff, Chic Style, and Mirror, Mirror on my Wall. Other popular products are the Pottery Wheel, the Metal Tapping 14-Piece Project, Microscope Kits, and Motor-Works.