The shroud is the metallic silvery part that is over the main black hilt.
This slightly off topic discussion pretty much proves that any saber can be Jedi or Sith....
My bad :p The Arbiter is one I don't think has been mentioned. Its on sale and how could we forget it
Though I think the Dark Hilts are considered as Sith, but the size of the hilt just makes it feel dark even in silver.