9 years & up. Watch your marble run up and down the Archimedes Screw! Build a working model of Archimedes Screw with the Marbleocity Triple Play. Use the hand crank to send the marbles twirling up and rolling down. Marbleocity introduces children to engineering principles and physics concepts with dynamic hands-on STEM model kits made of precision-cut wood in the USA. Estimated one hour build time. Included: Laser-cut Birch Wood Parts, Plastic Accent Pieces, Marbles, Tinkineer Graphic Novel with Assembly Instructions.