A very heavy double pointed, but strong shuriken.
Made from steel and tempered, with a blackened finish.
Ikkaku-ken is the name given to a relatively modern style of shuriken, created in 1965 by modern day shuriken master, and author Shirakami Eizo. He left no successor as head of this Ryu. He was a student of Master Naruse Kanji (d. 1948), the 3rd headmaster of Negishi Ryu shurikenjutsu. Naruse Sensei was a student of Yonegawa Magoroku who was a student of the founder of Shirai Ryu, Shirai Toru.