These go around your ankle at you swing it while jumping over the end with your other foot. There is a counter on the ball end to count how many times you've jumped it. THIS IS VERY HARD TO DO......IF YOU'RE OLD AND OUT OF SHAPE.....SUCH AS THE AUTHOR. This toy is very popular still today and this was the first version and is relatively rare. Purchased at the Salvation Army for 49 cents and sold for $31.