Oxygen mask hook receivers on both side of the helmet. We do not deliver on public holidays.We have noticed that there are usually considerable postal delays if there are public holidays at your end, so please take this into consideration. Please inform us for any problem before you give us feedback. Thank you for Shopping and Watching. This item is in the category "Collectibles\Militaria\Surplus\Hats & Helmets".fajar" and is located in this country: ID. This item can be shipped worldwide.