14 years & up. Expand your hobby with this guitar mechanical model that is not only a self-assembly toy, but as well as a fully-fledged musical instrument. Create sound by turning the hand-turned wheel that brushes against the bourdon and melody strings. Gears and reduction mechanisms move strings around and adjust their heights to make new sounds. Approximate time for assembly: 4-5 hours. Measures 8.7"H x 6.5"W x 15.7"L. Includes 292 pieces and detailed instructions.