Mechanical parts and animated liquid filled hoses attached to the avatars right temple. The back of the head has another circular attachment as well, although this part might show better with bald heads. Typical humanoid hairs cover it up.

Hoses will not disappear under lights or behind glass, as some cyborg parts do.

Each Borg has a special personal solution flowing through his tubes, which may change color due to its ingredients changing over time. Do not count on the liquid color remaining the same.

Try before you buy, colors subject to change, W2MA Mark