Clackers come under a variety of names. The toy has two plastic balls joined by a string with a ring in the center of the string. To use the toy, you put your finger through the ring so that the two balls hang down. By pulling on the string in the right way it is possible to get the balls to tap (or clack) together. With the correct hand movement the balls can clack faster and faster, and louder and louder, until they meet not just at the bottom, but also right at the top above your hand. The toy ended up with a bad press because there were incidents when the clacking balls broke apart so creating a safety hazard.