Two 2 or 3 inch balls suspended by string with a handle in the middle. You knock them together by holding the handle with one hand and swinging them up and down. The jingle... (yes I still remember it!) "Kerbangers on the left, Kerbangers on the right, Kerbangers, Kerbangers, Kerbangers're dynamite! Kerbangers! While you walk, Kerbangers! While you talk... They won't chip, shatter or peel at all. In a little white light Kerbangers will glow. Kerbangers while you stand, Kerbangers while you sit, Kerbangers do their thing with a flick of the wrist!..Kerbangers! (LOL) Thanks for the visit to my childhood. Keep up the good work!