Engino- Stem Toys, Construction Toys For Kids 9+, Mechanics: Levers, Linkages & Structures, Educational Toys, Stem Kits, Gifts For Boys & Girls (16 Model Options)Kids Learn How Levers Can Be Used For Increasing An Applied Force Or Changing The Direction Of Motion And How They Integrate With Structures. Build 16 Working Models Such As A Seesaw, A Double Deck Bridge, A Parking Gate And More. Easy To Follow Instructions + Includes 12 Pages Of Theory And Amazing Facts With Explanations Of The Different Scientific Principles Accompanied By Fun Experiments To Test Newly Acquired Knowledge. A 4 Page Quiz Section Is