Kit for building a trebuchet based on Leonardo da Vinci's design All parts are pre-cut and ready to build; Can be built in about an hour Ages 14 years and up; Made of natural untreated wood from sustainable forests; Parts are pegged for extra strength Encourages spatial reasoning, logic, STEM skills; Inspires an interest in engineering and history Finished model measures 24.5 x 12.5 inches; Includes trebuchet parts, clay ball, instructions Though there's no record of it ever being tested in battle, Leonardo da Vinci's trebuchet, as presented around 1482 in his Codex Atlanticus, is nonetheless a remarkable reimagining of the time's most powerful piece of weaponry. Now, you get to build it yourself!