Young thinkers can design unbelievable ball track structures via simple, stacking planks. No glue, no connectors-just loads of constructive fun! The 50-Plank Set helps kids get things rolling with two balls and an instruction book detailing how to build a "Shooting Gallery," "Turbine," "Step Curve" and more. Fully compatible with the larger, 200-Plank KEVA Contraptions Set (not included). Ages 7 and up. KEVA Contraptions are fantastic toys for teaching children to embrace their creativity and design engineering marvels. Perfect for any child looking to build and learn problem solving with basic physics. Includes 50 identical wooden planks, 2 balls, and 1 idea book with project photos and quick start instructions. Age: 7+ years/Grade 2-12