MICKI Mickey Co. Knockout Ball Currently sold for 12,100 yen. When you hit the wooden balls with the hammer, they roll out from the holes below. Children become engrossed in watching the balls that have fallen inside roll around. At first, they can't use the hammer well, so they play by pushing the wooden balls in with their hands. It's a beautiful item without any noticeable scratches or stains. However, it is a used item, so please consider purchasing only if you understand this.