So Daniel went to China. He got me a present. These are the directions. Let's not ruin this with more words.
"Method of use:put two balls in your palm, make each ball turn and twist the other so that your fingers moving drive the muscles of the hand and arm to stretch and relax. Two hands can play them in turu. A hand can also play 3 or 4 balls at the same time in different ways. 'Great Wall Brand' health balls with present good health to you."