Ok, I have 9 masks in my inventory, dont wanna wear them since I use my enchanted dragon scale helmet, are them part of any quest?.
Thanx.

They are just stat boosters I guess.

Are they used for the secret room near Labyrinthian? If you don't know what I'm talking about: outside of Labyrinthian, there's a covered hut that has crumbling statues and the remains of a mercenary/bandit, with a wooden mask.If you equip the wooden mask, you get teleported to a sealed room that has the statues in prime condition, and each one corresponds to a dragon priest. Trying to activate the statues just brought up the message that I don't have the required item. I strongly suspect that you'd need the dragon priest masks to activate those statues (I didn't have any of them at the time, as I sold the ones I did have off since I didn't want them; didn't think I'd need them, and I don't think I can get them back ).

Cool I didn't know that! I thought they were useless except for the bonus they provided.

Have you tried getting them back? Some items seem to never disappear from a vendor's list if you sell it to them. I sold Nettlebane (a sword from a quest) to a dude in Whiterun at around level 12 and it's still in his inventory (I'm level 52 now).

Unfortunately I don't remember who I sold it to. Maybe someday I'll run into who has it so I can buy it back.

http://www.uesp.net/wiki/Skyrim:Bromjunaar_Sanctuary