In the "Harry Potter" books, the four balls used to play Quidditch are the Quaffle, the two Bludgers and the Golden Snitch. The Golden Snitch is a self-propelled ball with wings. A game of Quidditch cannot be won until the Snitch, which is worth 150 points, is caught.
The Quaffle is a red ball that is thrown and kicked from one player to another; throwing it through any of the three hoops at the opposite team's end of the Quidditch pitch earns a team 10 points. The Bludgers are two smaller balls made of iron that are bewitched to fly around and try to knock players off their brooms.