2 years & up. Fossils inspire children's imagination and excite young learners. They will delight in discovering and examining this set of 8 realistic and tactile specimens. The set includes ammonite, clam shell, fern leaf, preserved leaves, sea urchin, shark's tooth, shrimp and trilobite. Made from a unique stone mix, they are durable enough to be used outdoors. Each fossil measures approximately 3 1/2".