"Sign blanks are for your more generic sign projects. You have many choices here of Aluminum Sign Blanks that come in a painted gloss white color on 2 sides with a baked enamel finish. In terms of the 5 available sizes you can choose from 12""x18"" all the way up to 36""x48"" and the thickness starts in 4 sizes as small as .032"" all the way up to .080"""