Manufactured in Japan, these laser cut dinosaur models are made of structurally stiff recycled black paperboard. The kits assemble easily by inserting slot into slot and take about half hour to assemble and require no glue. The 64 piece tyrannosaurus, the 71 piece aquatic futabasaurus and 88 piece triceratops are all about 8" long. The 17 pteranodon has a wingspan of 11". Each kit comes with an easy to follow assembly diagram and a first timer will have little problem putting these dinosaur models together.