Sourced direct from ADI this is a Hero Chopper Predator mask. It is fibreglass with a metalized coating which has been dirtied down. The underside has a towel attached for comfort and three holes where the magnets would have held it to the undermask.
The upper portion of the helmet is missing and there are obvious signs of set damage. As details are drybrushed, in the correct light this appears to be matchable to the death scenes. Chopper's body is thrown across the floor into a wall and it is assumed that this caused the damage. There is also a scuff to the chin and feint green Alien blood acroos the cheek.
