Iron Armour Seal

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Iron Armour Seal

B's Iron Armour
Kanji 鉄甲封印
Rōmaji Tekkō Fūin
Literal English Iron Armour Seal
English TV Iron Shell Seal
Manga Chapter #408
Anime Naruto Shippūden Episode #142
Movie Naruto 5: Blood Prison
Game Naruto Shippūden: Ultimate Ninja Storm 2
OVA Naruto Shippūden: UNSG anime cutscenes
Appears in Anime, Manga, Game and Movie
Classification Fūinjutsu
Class Supplementary

This is the fūinjutsu that was used to seal Gyūki into Killer B, which takes the form of the kanji for "iron" (鉄, tetsu) on his right shoulder. Not much is known about the seal, besides the fact that it was stated by B to be of lower-quality and weaker than the Four Symbols Seal, which contained Kurama inside of Naruto Uzumaki.[1]


  • In the manga, the seal is depicted as being black. In the anime however, the seal is blue.


  1. Naruto chapter 496, page 7

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