K'Nex Beginner 40 Model Building Set Features: This innovative STEM toy allows children to explore science, technology, engineering and maths, while having fun and developing their creativity and imagination This beginner building set includes 141 parts, including K'NEX rods and connectors Build & re-Build Instructions and ideas for 40 different models are included, like a car, a skyscraper, an airplane, a rowboat, and so much more! Set comes with an easy-to-follow instruction manual Suitable for ages 5+ Instructions and ideas for 40 different models are included, like a car, a skyscraper, an airplane, a rowboat, and so much more! Specifications: Dimensions: H:20.5 x W:31.0 x D:8.8 cm Guarantee:1 year Material: Plastic/Metal Model Number: KN15210 Self Assembly Required: Yes