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Shingeki no Kyojin (SNK) or Attack on Titan is a Manga and Anime series. This is a slightly stylised version of the Recon Corps Logo, made with Strong Flexible Plastic, also available as Polished.
A little smaller than your hand, see below for a more precise measurement of size.
Note: the small, thin parts on the bottom of the logo are actually too thin for this material, they are quite fragile so be careful.