Chakra Blade

A chakra blade is a weapon made from special metal that absorbs the user's chakra characteristics and exhibits power based on the user's technique. Asuma Sarutobi, Sora and Shikamaru Nara use techniques that require the use of a chakra blades like the Flying Swallow technique and Shadow Imitation Shuriken Technique. THe White Light Chakra Sabre wielded by Sakumo, and later Kakashi Hatake, also had the ability to absorb their chakra and give it off as a white streak of light whenever they swung it.

Trivia

 * Asuma taught Naruto Uzumaki the fundamentals of the wind nature with these blades during Naruto's Wind Release training.
 * Chakra Blades seen in the series include Asuma Sarutobi's Chakra Blades, which Shikamaru inherited after Asuma's death, as well as Sora's Chakra Enhanced Triple-Bladed Claw.
 * In Naruto Shippūden 4: The Lost Tower, it was revealed that Konohagakure has a standard chakra blade that is used by some shinobi.