Plastic propellers holding a detachable centre piece are rotated at high speed and released randomly from one of five traps. They fly out in an unpredictable way; sosaid buzzing through the air. It is designed specifically to simulate as closely as possible the old sport of live pigeon shooting. Its original name of ZZ comes from the inventor who made them out of zinc, and had previously shot a specific breed of pigeon called a zurito; hence the term the zinc zurito. World and European Championships are held every year.