I had a couple, they got on my mom's nerves so they were strictly an outdoor toy at our house.
Do You Remember Those Klik Klak Klackers ?
The balls were actually made of a hard plastic resin and to my knowledge were banned and taken off the market. The balls would develop hairline cracks and eventually shatter during use, causing injuries to the eyes and face.
Yes! I had an awesome green set, but a friend of mine borrowed them and never returned them. I wish I still had them, especially now that I know that they are selling for 35 bucks! Lol