12-string, set of 12. Totally professional in design and performance. Small, lightweight, this precision made machine fits guitar headpieces that will not take full size machines. The mini buttons provide more space for player?s fingers (even large fingers) to tune strings. Gear ratio is 14 to 1. Sealed in lubrication keeps the mini perfect for a lifetime! Includes 5/8? washers, bushings and wood screws.