Every young engineer can build objects from the real world. The set is made of durable plastic and includes a spanner, screws, pulleys, nuts, etc. Various designs and 8 large size cards included. Detailed examples of construction with progressive stages, helping the child´s attention and reasoning. To begin making more complex assemblies developing creativity. Improved component design and better quality materials! Extremely easy to thread! With progressive difficulty model cards to create different models. Each set includes 191 pieces and 8 cardboard activity cards.