K'NEX BUILDING SETS: Included in each set is a step-by-step manual to help bring imaginations to life! Bringing together Science, Technology, Engineering, Arts, and Math with imagination, K'NEX provides specially designed toys for every age. KIDS CONSTRUCTION TOY: With 325 pieces and 20 different models to build including a Skyscraper, a Castle, a Treehouse, a Arch Bridge, and much more, there are plenty of ways for children to grow and develop while learning with this building set. EDUCATIONAL TOY: This engineering set encourages the development of fine motor skills, dexterity, spatial awareness, and problem solving using the color-coded rods and connectors specially designed to click together. IDEAL GIFT FOR CHILDREN: Great as a birthday gift or Holiday present for boys and girls, K'NEX building toys for kids allow children to explore their creativity as they learn and develop.