Turn playtime into a fun-filled, skill-building activity that your child can enjoy while learning! Bring back the fun of playing without digital devices with the Imagine 521 Piece Value Tub Building Set from K'NEX, and keep your child engaged for hours in a challenging and entertaining game! Become your child's best buddy by spending time building and creating with him! This building set contains 521 rods and connectors that click together in a multitude of 3D configurations! Let your kid construct basic 3D figures on his own, and guide him to create more complex structures that will expand his imagination. Your children can build up to 35 different structures with the colorful pieces and learn about basic building concepts with this K'NEX construction educational toy. This building set comes with a sturdy plastic tub for hassle-free cleanup. It lets you store your child's models and the loose pieces, so you can bring it with you on family trips! Each set also comes with an easy-to-follow instruction sheet to guide your child in building 35 models of varying difficulty and size! Allow your children to create structures from a patrol bot to an amazing dragon that will bring their imaginings to life! Promote the development of STEAM (science, technology, engineering, arts, and math) concepts by igniting your children's natural curiosity and creativity. Building with K'NEX puts children on the path to a fundamental understanding of STEAM subjects. Let them design, construct, and customize their own K'NEX models and enjoy hours of fun playing and learning with them. Learning is never as fun as it with this 521-piece building toy set! Get your children a K'NEX 521 Piece Value Tub Building Set today, and let them treasure the time spent in intellect-enriching playtime with you!