This military protection tactical gas mask PBF yellow / brown with dark spots (because too old) but the gas mask is never used. was made for USSR Army Officers and senior command personal. Now mainly used by Stalkers in Chernobyl and cosplayers. Also called Gorilla, Hamster and Pig. Comes with safe filters (charcoal) which don't contain asbestos. There are yellow stains on a PBF mask, because of long-term storage.