first things first, theres no way its hair it actualy looks like it has skales up close, the rings or beads that bind it are just decoration. I personaly believe that their dreads are something more like cartalage, its flexible and fairly tough, compared to fire or pressure(wich also disproves that it could possibly be hair fiber, becaus in AVP Charles Weyland torches the back of Scar and the dreads do not burn like hair would) thats my thoughts.