The Original Magic Rocks Crystal Growing Kit (Shark) NSI International The Original Magic Rocks Instant Crystal Growing Kit lets kids create a brilliant and colorful crystal garden in minutes. This deluxe crystal growing kit includes 0.44 ounces of magic rocks, 4.5 ounces of sodium silicate growing solution, a 6 x 3.5-inch aquarium tank with decorative objects, and detailed instructions. Rocks will grow to different heights but may be as tall as 4 inches. For ages 10 up. LI Toy Game is a local family-run toy shop on long island, with a physical retail store strong online presence. We have an excellent reputation because we have both brand new and rare vintage finds (which sell quickly), provide honest and accurate descriptions you can trust, and always take care of our customers! We are closed on Mondays, ship Tuesday - Saturday, and offer local pickup at our store in Kings Park. Thanks for looking, and have a great day!