5 years & up. Build a catapult and explore how it works! The catapult is a device with a lot of power. Build one and see for yourself how ancient armies used to conquer their enemies with the Koontz™ Catapult kit! Did you know a catapult is a siege engine used to hurl a projectile (usually a large stone) to a great distance. Made from durable, lightweight, recyclable cardboard. Includes simple step-by-step instructions and a fun activity booklet. 12 pieces.