Iron Armor Seal

Iron Armor Seal
Kanji	鉄甲封印
Rōmaji	Tekkō Fūin
English TV	Steel Shell Seal
Debut
Novel	Naruto: A Shinobi Story
Data
Classification	Fūinjutsu
Class	Supplementary
User(s)
Blue B Killer B

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Iron Armor Seal (鉄甲封印, Tekkō Fūin) is the fūinjutsu used by Kumogakure to seal Gyūki into its respective hosts.

Usage

The seal itself takes the form of the kanji for “iron” (鉄, tetsu) and is usually printed somewhere on the jinchūriki’s body: Killer B’s right shoulder and Blue B’s chest. According to B, this seal is a lower-quality and weaker seal than the Four Symbols Seal which was used to seal Kurama into Naruto Uzumaki and Kushina Uzumaki.

Trivia

• In the manga, the seal is depicted as being black. In the anime, however, the seal is blue.
• In the anime, the Five Elements Unseal appears to be strong enough to break the Iron Armor Seal.

References