NEW NATIONAL GEOGRAPHIC Da Vinci Model Kit Catapult STEM Toy Engineering Model

BUILD THREE REMARKABLE MACHINES - a Ballista (an enormous crossbow), a Bombard (an early form of the cannon) and a mighty Catapult. SEND PROJECTILES UP TO 15 FEET - Each model is fully functional; the kit comes with 15 projectiles plus 6 paper targets. EVERYTHING YOU NEED - Assemble each model in 1-3 hours: laser-cut wooden components, rubber bands, sandpaper and clear, simple instructions. No special tools necessary.