This papercraft is an Evangelion Unit-00's (EVA-00) Entry Plug, a capsule-like tube that houses the pilot in the Eva, from the Manga / Anime / Film series Neon Genesis Evangelion, the paper model is created by ISHI.
Entry Plugs are inserted into an Evangelion's spinal area via a loading mechanism, after which it spins inward and locks itself firmly into the Eva's torso. The standard color for the most used Entry Plugs is white, however, the ones controlled for the Dummy Plug system are red. Plugs appear to be extremely resistant to damage, as can be seen with the Unit-00's entry plug, which survived the Eva's explosion.
You can download this papercraft model here: Neon Genesis Evangelion - EVA-00's Entry Plug Free Papercraft Download [Box] [Gavitex]