Explore the fascinating world of crystal growth with this National Geographic Glow-in-the-dark Crystal Growing Toy. This educational toy is perfect for science enthusiasts aged 12-16 years. The toy comes in a weight of 1 pound and features a captivating glow-in-the-dark crystal effect that is sure to excite any young scientist. With its binding as a toy, this crystal growing kit promises to provide hours of entertainment and learning. The color of the crystals is a stunning glow-in-the-dark that adds to the overall experience. This toy is a great addition to any collection and is perfect for those interested in science and nature.