Warning! These dinosaur bones are guaranteed to cause a lot of excitement! Cast from a durable stone and resin mix, these bones are just waiting to be discovered. Bury them in sand, soil or even water and they will instantly appeal to children's instincts to explore, investigate, sort, collect and measure. Encourage children to match, count, compare, order and measure the bones they discover with the Match and Measure Card Set (207463 sold separately). Perfect for all those budding paleontologists!