The ladys were so excited when the owner of this device allowed us to borrow it for our meet. The idea is the cage allows No movement so when the thick wooden batten is inserted between the slaves legs it has little choice but to stand there and watch. Then one by one the floor slats are removed. When the last one is removed the slave crushes its own nuts under its weight. We put this cage outside thinking the cold would ad an extra torture to this punishment.