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This is the Noble Kanohi Hau, Mask of Shielding, worn by Turaga Lhikan. The mouthpiece is an axle. If you are part of the Facebook Maskposting group, the 3D model file is downloadable for free. This is for the convenience of anyone who doesn't own a 3D printer.
Update: This model has been remade to match its movie depiction better.