The Chakra-Ki are set of six special kunai knives. Each one holds its unique ability and power. The Chakra-Ki were found by Tuyu during his stay in Spain. As Tuyu opened the chest that contained the 6 knives, a voice called out that told Tuyu each of their names. Each kunai has a special blade that is extremely sharp. Only the strongest of knife throwers can handle these. Tuyu usually equips modifications such as poison darts or fire starters to increase effect. Maybe, soon, the story behind the Chakra-Ki will truly be revealed.