This paper model is a X-01 Helmet, a piece of X-01 Power Armor found in the game series Fallout, the papercraft was created by Sinner. The size of finished model is about 280 (H) x 419 (W) x 294 (D) mm.
The X-01 power armor is a set created by the remnants of the U.S. military after the events of the Great War, and it improves upon the pre-war suits by offering superior protective abilities. The power armor bears considerable resemblance to the advanced power armor seen in previous Fallout games, mainly due to the helmet design and general style. X-01 power armor provides the greatest defense among all other models of power armor featured in Fallout 4 thus far such as the raider power armor, T-45, T-51, and T-60.