K'nex STEM Explorations Roller Coaster Building Set BasicFun! JEU DE CONSTRUCTION K'NEX Stem exploration gears K'NEX STEAM Education Gears Building Set Engineering Educational K'NEX 15214 12 Model Rad Rides Building Set, Educational Toys for Boys. Prepare children for the real world at an early age with the K'NEX STEM Explorations Gears Building Set! K'NEX STEM Explorations Gears Building Set contains 143 assorted parts and pieces so children can build three fully functioning, unique geared models such as a crank fan, an egg beater, and a car window! K'NEX rods and connectors are plastic and made with a high quality construction. This engineering educational activity comes with a handy illustrated instruction manual to guide children through their building adventures. The sheet includes construction ideas and tips for students to help them create structures on their own. This building set also includes three downloadable activity sheets to guide children through hands on, inquiry based experiments. Age: 8yrs+ Pieces: 143