The tradition of metal construction sets dates back to the distant 18th century. Many generations of famous inventors, mechanics and engineers grew up on these construction sets. Thanks to this toy, boys (and girls) acquire their first skills in connecting parts with screws and nuts, develop their imagination and spatial skills. The "TechnoK Invisible Airplane" model was created based on secret military technologies for reducing the visibility of combat vehicles - aircraft that are barely noticeable to enemy radars. Please note that the model has on-line support on our YouTube channel.