The NEW OM-90 Gas Mask Respirator Size M is a collectible military surplus item that falls under the category of gas masks and personal field gear. This respirator, with a militaria theme, is designed to provide protection against harmful gases and fumes, making it a practical and necessary piece of equipment for those interested in military gear and collectibles. With its authentic design and functionality, this gas mask respirator is sure to appeal to enthusiasts and collectors alike.