Kunai

A Kunai (クナイ), like shuriken, is one of the more basic weapons seen in Naruto. It is a black dagger designed to be thrown that is about the length of one's hand. Many ninja attack by attaching an explosive tag to the blade. The kunai is commonly thrown so that it lodges in an object near the target, and then the explosion from the exploding tag destroys it (the target).

Different types of kunai have been seen in the series. Minato Namikaze used three-bladed kunai that had a special seal applied to them to perform his Flying Thunder God Technique. During their battle with Hidan, Izumo and Kotetsu use kunai the size of blades to attack him with. Kabuto, when threatening to kill a hospitalized Sasuke in Part I, holds a kunai with a curved blade to Sasuke's neck.