Crossbows and Catapults

Features: - Learn the ancient mechanism of siege weapons. - Understand basic concepts of physics: force, energy and motion. - The safety designed bolt powered by rubber band makes it safe to launch. - Observe how the designs and power output have evolved and improved. - 10 models: crossbow, trebuchet, catapult, etc. Content: - 110 pieces components - 10 models to build - Colorful Manual Provided Dimensions: L:33cm x W:6.5cm x H:22.5cm Weight: 0.6kg