Although I admit it's hard to gauge sizes from a photograph, I was expecting something larger than a thumb nail as a Spinosaurus tooth, given that the Spinosaurus was one of the largest meat eaters to walk the earth. My son had put this on his Christmas list but it didn't make it to his stocking. His other collection of dinosaur teeth are all relatively size appropriate to the size of the dinosaurs. However, in saying that, from what I can remember this was a really cheap item so in hindsight I shouldn't have ordered it in the first place. Won't be using again.