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I need the background of this ui, the stuff in the material package is enlarged and a bit blurry

They are provided in 32x32 size and must be used as 9-slice objects( can also be named as 9-patch object, depends on the engine you are using, but they are the same). I checked the file, and It's not blurry, you are probably enlarging the image as a sprite.  I might be able to help if you tell me how are you using the image.