The Dinosaur Fossil Polyhedral Dice Set features seven authentic fragments of a variety of dinosaur fossils from across the Mesozoic, ranging from 150 to 66 million years old. This awesome set seven dice, each with a fragment of a dinosaur fossil from the Mini Museum Collection. This includes T. rex, Pachycephalosaurus, Edmontosaurus, Alamosaurus, Stegosaurus, Triceratops, and a Coprolite (Dinosaur poop). The dice measure 18mm with a 23mm D20 and come with a magnetic clasp display box and certificate of authenticity.