they are Diamond Based thats why they can pierce through the marines or Preds hardest metal and always look Shiny especially n Aliens ive checked all other movies and aliens is the clearest and c ooolet besides fom AVP

(all acid proof armor)2Writsblades(acid proof),comitstick(Acidproof),2shurikens,Smart Disc(Acid Proof),speargun,plasmacaster, netgun,cermonial dagger,and 2elder daggers(acidproof,and there from Pred2)