Helix Marble Run by Engenius Contraptions is a fascinating construction created from natural wood, glass and paper. The Helix marble run has been designed with both simplicity and reliability in mind. An elegant combination of laser-cut plywood parts and paper straws, this kit is straightforward yet rewarding to build. Inspired by Victorian cast iron engineering, the balls revolve three times around a helical track that’s over two metres in length. The motor-driven lift keeps the marbles moving in almost perpetual motion. The laser cut wood slots together precisely to build a robust and fully working machine that is thrilling to see in action. Age 10 years – adult. Completed dimensions: 30.5 x 32.5 x 56 cm Educational Benefits of Helix Marble Run by Engenius Contraptions: learn about kinetic energy and forces encourage experimentation and scientific enquiry 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: Laser cut , slot together plywood; electric lift motor with gearbox; construction straws; balloons; dowels; glue; screwdriver and screws; battery case; recycled glass marbles; fully illustrated instruction booklet and instruction videos. Requires 2 x AA batteries (not supplied)