Fighters for a Free North Korea (FFNK) is an organization formed in South Korea that is known for periodically launching balloons carrying human rights and pro-democracy literature, DVDs, transistor radios and USB flash drives from South Korea into North Korea. Over two million such balloons have been launched. The balloons, which generally reach their destination area after three to four hours in the air, are timed to release their materials in the Pyongyang area.