This amazingly detailed DIY model starts as a set of 4-inch square metal sheets that you turn into an amazing 3D skeleton! Use the easy-to-follow instructions to pop out the 45 pieces, bend the tabs, and connect them at the attachment points. Tyrannosaurus rex (commonly abbreviated to T. rex) was a bipedal carnivore with a massive skull balanced by a long, heavy tail. It was among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event. Assembled dimensions: 6.7 x 0.87 x 2.4 inches.