Any idea what this is ? They are" Clackers". I use to play with these when I was a child. I got these in a box at Auction. I knew right away what they where. They are basically 2 large marbles hanging on a string. You swing them together so that you hear the clacking noise. It is possible to get them going sooo fast that they clack above the hand and below. I have them hanging in my studio . I vision of my childhood. The memories of hitting my self and my sibling in the head. My childhood was sooo much fun.... Take a few minutes to remember one toy you enjoyed as a child. Merry Christmas!