Chakra Blades

A highly uniquely-designed trench knife, these blades are worn like brass knuckles, but each one has a sharpened zigzag "tooth" over each knuckle, and a blade coming out of one end. Asuma Sarutobi couples these knives with his taijutsu skills to great effect, such that he can take out nine Sound ninja in a matter of seconds. The knives are made from a special metal that can be infused with elemental chakra or Yin-Yang chakra to produce added effects.

When infused with wind-natured chakra through "Chakra Flow", it can easily pierce through stone. When infused with Shikamaru Nara's shadow chakra, it can immobilize anyone whose shadow it pierces. The knives' damage and effect can also be maximized if the person has a better control of their chakra as seen with how Asuma was training Sora and with Naruto Uzumaki in focusing their wind chakras into their kunai.

The knives are currently in the possession of Shikamaru Nara who uses the blades to perform the Shadow Imitation Shuriken Technique. He is able to infuse the chakra blades with his own chakra allowing it to absorb the characteristics of his chakra, thus allowing the blades to exhibit characteristics of his Shadow Imitation Technique.

Also See

 * Flying Swallow
 * Shadow Imitation Shuriken Technique