Instantly captivating, the award-winning Perpetual Motion Double Marble Run by Engenius Contraptions is a superb marble run that helps children and teens develop STEM skills and knowledge. It is also the ultimate executive gift for adults to liven up their office! A rewarding flat-pack marble run to construct, it’s a joy to build then see in action. First follow the instructions to construct the marble run from laser-cut plywood and then start the motor. The marbles are raised to the top of the lift by an electric motor and cogs. The marbles then descend in a mesmerising perpetual motion down an incredible spiral and a clitter clatter zig-zag track. Age 10 years – adult. Educational Benefits of Perpetual Motion Double Marble Run by Engenius Contraptions: experience and learn about cogs and motors develop ability to follow instructions – pictorial printed version and video develop visual working memory develop attention learn about cause and effect develop sequencing skills develop fine motor skills Contents: 54 piece Laser cut , slot together plywood; electric motor with gearbox; drive cog dowel; screwdriver and screws; battery case with off/on switch, 4 white marbles and 4 black marbles; fully illustrated instructions and build videos. Requires 2 x AA batteries (not supplied) Completed dimensions: 45 x 23 x 19cm.