In the organized game, each player has three weighted and feathered darts, generally about 16 cm (6 inches) long. The player usually begins with any double score (dart thrown into the double ring). They subtract this and subsequent scores from a previously chosen number, usually 301 or 501. The winner must reach exactly zero on his last throw. In informal games, players usually total up their scores from the start and declare the player who first reaches a predetermined number the winner.