what quidditch players fend off the bludgers

In the wizarding sport of Quidditch, the Beaters fend off the Bludgers. The Beaters are responsible for defending their teammates from the Bludgers, which are round, jet-black balls made of iron that fly around violently trying to knock players off their brooms. The Beaters carry short wooden clubs, which they use to knock the Bludgers away from their teammates and towards their opponents.