When we were growing up everyone in school had a pinky ball to bounce against the old brick wall of the school. But you were never allowed to bounce the ball in the school halls. Once I was walking down the hall, bouncing my ball and a teacher stepped out of a classroom and demanded my ball. I said I only had dropped it. He said “once yes, twice maybe, but three times no”. I lost my ball. So, we sell them in pairs in case you lose one ball.