Brass Knuckles Washington State

In Washington State, brass knuckles are illegal to possess, manufacture, or sell. Under RCW 9.41.250, the state classifies metal knuckles and similar striking weapons as prohibited weapons.
Possessing brass knuckles — even as a collector’s item — can result in misdemeanor or gross misdemeanor charges, depending on the circumstances.
The law applies to all types, including metal, hard plastic, or disguised versions like keychains.
Washington has one of the strictest policies toward self-defense tools, so residents are advised not to buy, carry, or import brass knuckles into the state.

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See the full guide: Are Brass Knuckles Illegal in the U.S.?