Wonderology - Science Kit - Hidden Treasure Mining by Science Educational Focus: Science, Creative Thinking STEM TOYS Manufacturer's Suggested Age: 8 Years and Up, Education Level: 1st Grade, 2nd Grade, 3rd Grade, 4th Grade, 5th Grade, 6th Grade Science Designed For Kids, Wonderology Hidden Treasure Mining Science Kit Gives Them A World To Explore. This Is A Great Geology Toy That Lets Them Uncover Hidden Gems With The Included Hammer And Chisel. Each Science Kit Includes 8 Colored Rocks That Are Hidden Inside A Plaster Block.