2 years and up. Children can learn about aquatic life through play with the Magnetic Matching Fossil Stone set. Interesting textures, a subdued natural color scheme, and authentic replicated fossils will spark a deeper interest in science activities inside and outside the classroom. Set features 8 matching sets of fossil stones, that when opened, reveal a fossilized imprint of different species of fish and aquatic life. Encourage color matching and shape recognition while children learn about extinct species. Largest piece measures 2.9"L x 2.2"W x .8"H.