Auspicious fly on brass horse, the Chinese called it "Ma Shang Ying", meaning you will win instantly.
This is a rare piece of feng shui item, it is to be used to increase windfall luck and gambling luck. It is not limited to only winning in gambling and lottery, but it also helps to win in any of your competition. It is about a legend of an old general during the Ching dynasty which is always winning in his battle during the war. He never bath for his horse when he is about to go for battle, and people will ask him why you don't clean your horse, and he said if the fly is going to stay on my horse, meaning I will win the battle, so the story passes on.