Chakra Threads

Chakra can also be extended from the body for attack and defense. This can take the form of the chakra strings used to manipulate puppets in Kugutsu no Jutsu. It can also be focused to a fine point for cutting, such as in Kabuto's chakra scalpel. It can also be used to form a defensive barrier in Chakra no Tate.

Usage
These strings are constructs made from very concentrated chakra so, they can be seen by people besides the user. A skilled user can suppress the chakra so that the strings become invisible, as Chiyo did with the Manipulating Attack Blades to sneak a string to bind Hiruko's iron tail.[2] These strings essentially act as an extension of the user which allows them to manipulate whatever is attached to their strings such as hidden weaponry in a puppet as they please.

In one instance, Kankurō uses chakra strings to trip Naruto Uzumaki when they first met.[5] In another, Chiyo uses chakra strings to control a person like a puppet. Kankurō has shown the ability to attach his chakra strings to those of another user's.[6] This technique is limited to one main string per finger for normal humans, but Sasori's modified core was able to emit enough strings to control over one hundred puppets.