Each 3D Dinosaur Puzzle in this series poses a fun challenge that children will love, while helping to develop their problem-solving ability. These puzzles develop fine motor skills as well as teach children dinosaur identification. Puzzle pieces are expertly designed to lock into place with one another creating a dinosaur kids can play with once built. All puzzles can be disassembled and rebuilt again and again and come with easy assembly instructions on the back of each window box. Dinosaurs available in the series are: Tyrannosaurus Rex, Deinonychus, Styracosaurus, Iguanodon, Pachycephalosaurus, and Dilophosaurus. Each dinosaur is approximately 5" long. This company also offers an excellent Jr. Science Explorer™ Microscope Set and a Jr. Science Explorer™ Telescope.