Binding Tag

Binding Tags (縛札, Baku Fuda) are scraps of paper inscribed with a special writing, centering around the kanji for "restrain" (縛, baku). Infused with chakra, they are used by Kusagakure's Police Force to stop others without excessive violence. When placed on someone, their body will become immobile, as if bound by ropes, leaving them unable to cause any other disruptions.

Kazō Yakusho had these tools created by his father, Kōza, after coming up with the idea for a police force made up of members of the Inagara Clan. He knew their use of their clan tools could cause some villagers to dislike them. By having a nonviolent way of stopping people, the police force's reputation would not fall.

Reference

 * Image used an explosive tag as a base.