This tool is often used by Ninjas to defend themselves or attack the opponent. Unique shape made of solid steel that can destroy the object that hit tool.
Because the unique shape, then in addition to be a weapon suitable also for display.
Used with slip on the fingers and clenched fist to fist bumps are solid steel.
Width: 11.4 cm, height: 6.8cm, thickness: 12mm, color: black steel and weighs about 300gram.