Flying Thunder God Kunai, Narutopedia

Flying Thunder God Kunai (飛雷神クナイ, Hiraishin Kunai) are custom-made kunai (特注クナイ, tokuchū kunai) and signature tools of Minato Namikaze, who uses them in conjunction with his Space–Time Ninjutsu: the Flying Thunder God Technique. They differ from a standard kunai in that they have three blades instead of one and the handle (which is thicker than normal) serves as the "marker" for Minato's teleportation ability. Minato also said that these blades are a bit heavier than a normal kunai. Their prongs

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Flying Thunder God Kunai, Narutopedia

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