I'm sure that these were the names of them but I am sure someone might put me right. They were around late-60's/early-70's. They two small balls on each end of string with a hoop in the middle that you held in your hand, then you had to get the balls to knock together, then when you had built up speed you tried to get it to swing and hit together above your hand and then below your hand. You'd end up with alot of bruises on your hands if the missed.
Do You Remember Ker Knockers?
Do You Remember Ker Knockers?