Unlike other 3D model kits, these durable, eco-friendly cardboard models are put together from one side to the other. Instead of putting the model together from the ground up, each piece is a single "vertical plane" of the object; the first piece you start with may be the center of a Stegosaurus, which is just a flat piece of curved cardboard. The next piece, which is slightly smaller, is glued on beside the first piece and represents another vertical "piece" of the Stegosaurus. Each following piece on either side adds more depth to the figure until you have a completed, realistic-looking cardboard model! Kits come with detailed instructions and educational booklets which tell you a little bit about the animal. All kits are made with rice-based inks and 100% recycled cardboard. Finished models are between 4-10" tall and 6-20" long.