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The blades are made of 420 stainless steel. The handles are wrapped with black cord.
The Kunai is originally a general-purpose tool of ancient Japan, which was widespread in the craft. Thus, wood, brick or bone was mainly processed. But it also served as a moat, columns or caulking. The wide distribution of this everyday tool allowed the ninja to wear it completely open, so without further attention. In their experienced hands, it became a universal weapon.
In the case of hand-forged blade our blacksmith takes the already rolled spring steel and forges it with hand on the anvil or under the monkey (drop hammer). By forging becomes the steel more compacted (denser). Industrially rolled spring steel blades are made by cutting steel plate into strips under drop shears. Then they are ground or milled/grooved and without further forging directly put into the annealing furnace and hardened in oil bath. The qualities of both kinds of blades do not differ from each other much since the industrial rolling is already very good. On forged blades usually have forge traces, which give them an authentic and unique look.