Improves imagination, construction and problem-solving skills Store away all your parts and pieces in the convenient container 50 models to build from Instructions included Get ready to build with this amazing 25th Anniversary Ultimate Builder's Case. This building set includes 750 classic scale K'NEX rods and connectors for you start building with. The step-by-step colour-coded instructions feature 50 unique models of varying size and difficulty. There's a sailing ship, a fire truck or a light house and much more besides. Once you've built all 50 you can unleash your imagination and come up with your own designs. Most models can be built one at a time.