Elektra's Twin Sai are the personal weapon of Elektra. They are a traditional weapon from Okinawan martial arts usually used as a piercing weapon, but Elektra sometimes has used them as throwing weapons.
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The sai were originally owned by Jacques Duchamps, who used them in his attempt to assassinate Elektra. He was unsuccessful and ended up being impaled with his own weapons.
Elektra kept the twin sai and adopted them into her fighting style.