MBU-20 Oxygen Mask Gentex parts. Face piece frame is size medium narrow // Rubber mask is size small narrow but fits just fine for a display item. And not for actual use. This is mask comes with all parts pictured.Rubber mask has a small tear on the nose bridge (see pictures) but can still be displayed without issues. All parts pictured included, Check out my other listings for other flight gear. The item "Oxygen Mask MBU-20/P parts Gentex Pilot Flight Helmet for Parts" is in sale since Monday, April 22, 2019. This item is in the category "Collectibles\Militaria\Surplus\Hats & Helmets". The seller is "threebikerok" and is located in Enid, Oklahoma. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.