When the wind blows the propeller makes the woman swing back and forth like she is driving the ball. We have put a speed reducer on it to make it last longer in high wind and looks more natural. We can make it with or without the speed reducer. Original design animated outdoor wind driven yard art. Made with high quality wood, waterproof glue and automotive paint. All metal parts are brass or stainless steel. moving parts turn in bushings that are made to run under water.