Kit Includes: 24-page guide + 10 Split Rings + 1 Straw + 2 Wooden Dowels + 4 x Packs Air-Dry Clay + 3m Cotton String + 1 Bolt + 3 Nuts + 10 Washers + Cardboard Pieces Kids will love discovering the wonders of machinery and robots as they construct a catapult, make their own machines and experiment with basic robotics and physics! Perfect for inquiring young minds, the activities in this kit are fun and educational, providing a strong introduction to the wonders of science. By combining the items in this kit with common household objects, the Making Machines guide shows science enthusiasts how to do super-exciting experiments, simply and safely, at home. This kit includes materials to create your own medieval catapult!,Kit Includes: 24-page guide + 10 Split Rings + 1 Straw + 2 Wooden Dowels + 4 x Packs Air-Dry Clay