Also known as Knockers and Click Clacks, these heavy acrylic balls attached to weighty string had only one purpose: to be knocked together as fast and hard as possible. This resulted in shattered toys and shrapnel flying everywhere. Clackers were officially banned in 1985.

Clackers were taken off the market in the United States and Canada when reports came out of children becoming injured while playing with them. Fairly heavy and fast-moving, and made of hard acrylic plastic, the balls would occasionally shatter upon striking each other.

Clackers are a toy consisting of two plastic balls tied together with a string that can be swung up and down so that the balls "clack" when hitting each other. Although this toy has been banned in the U.S due to it being deemed a safety hazard, it remains popular globally, and was the subject of memes in Indonesia in late 2022.