Marbleocity Mini Coaster Build your own working roller coaster model made of real wood! The Mini Coaster is full of dips and turns with some engineering and physics thrown inso once you build your coaster, you can run marbles through it! The assembly instructions feature a graphic novel with the Tinkineer cast of characters Kelvin, Joule, Newt and friends to communicate meaningful STEM concepts in an engaging format. Its a fun way to learn about roller coaster design and conservation of energy while making an awesome kinetic sculpture! The Mini Coaster takes approximately one to two hours to build, and measures 6" when finished; for ages 9 and up. Made in the USA.