Imagine entering a garden on another planet. Developer dale holder certainly has. His take on the original silicate garden uses different chemicals to produce much more colorful, and way stranger mushroom and protista-like shaped crystal structures. Extremely interesting and endlessly fascinating activity includes materials for 30 students and instructions. Grades 6 -12. Due to the nature of this item, it cannot be shipped by air under any circumstances. Please select ground shipping at time of checkout.