Adamantine Sealing Chains

Used by Kushina, she is able to mould her special chakra into chains, which can be used to restrain targets. With it, she was able to restrain the Nine-Tailed Demon Fox in Naruto Uzumaki's mind. These chains also made up Kushina's seal, completely pinning the Nine-Tails down with several spikes in her mind.

Even while she was near death, Kushina was able to use these chains in the physical realm and restrain the Nine-Tails, enabling Minato to use the Dead Demon Consuming Seal. This involved five chains emerging from her back and burrowing into the ground, after which they would emerge and criss-cross multiple times over the target, holding them down.