National Geographic DaVinci Inventions Bombard City idle on Steam. Discover Da Vinci's Workshop and build your very own tabletop bombard! Based on the original design of Leonardo da Vinci himself, you can build a miniature bombard that can fire projectiles up to 15 feet! No tools are needed to build this incredible invention, with everything required being included in the kit. A perfect STEM kit for your future genius. Contents: laser cut wooden components, rubber bands, sandpaper, instructions, 6 projectiles, 6 paper targets. Packaging Dimensions: apx 16cm x 23cm x 6cm Interactive learning: Theres no better way for your child to explore the wonders of science then through a hands on science project. Age: 12+ Not suitable for children under 3 years