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Sai was discontinued after an update, but can still be activated if owned.
Ninja Sai
Release date 3 August 2015 (Update)
Members Yes
Slot Main hand
Equipment Main and off-hand melee weapons
Recolourable No
This cosmetic will not display
in PvP-enabled areas.

The sai is a cosmetic override available from the Death Lotus Training Treasure Hunter promotion, by completing the death lotus training scroll twice and claiming the sais from the prestige interface.