Improves construction and problem-solving skills Store away all your parts and pieces in the convenient storage treasure chest Put your building and construction skills to the test with the K'Nex 17435 Classic Constructions Building Set. Included are instructions/ideas for 70 unique models using Classic K'NEX pieces. You can build cars, planes, sea creatures, and much more besides! Loaded with over 700 K'NEX rods and connectors! You store away all your parts and pieces in the convenient storage treasure chest. Most models can be built one at a time.