It reminds me of something
back in the seventies there was a fad of kerknockers or something. Two little plastic balls on strings which would bounce against eachother whilst being held by
the kids. Often the see thru so called better models would shatter and leave kids blinded or at least scarred. All of the models bruised the users if they didnt shatter,
often breaking wrists. Of course they were banned. Sorry for this pointless story.
I am sad.