This Kids Wooden Puzzle - DIY Marble Run is a Water Wheel Coaster! The puzzle pieces are made of high quality laser-cut from sheets of non-toxic plywood. The kit comes with all the parts needed to build the Marble Run including sandpaper, wood glue, wax and hardware. This is a great gift for all kids (ages 14+ recommended) who like to engage in STEM learning. Marble Run incorporates various engineering mechanisms such as turning cogwheels and spirals. It stimulates creativity, focus, fine motor skills and patience. This Marble Run is sure to be a showpiece that the puzzle lover can proudly say they assembled! 254 puzzle pieces Assembled size 10" x 9" x 7"