To be readable on Magnets at 100' minimum 3", 5-6" is better. Black, white or KSTech color whatever that is.
For little window ones, they should be the size of the smaller SECCS stickers. 1.25" or so. These need a gray option if you make multiple colors. Red & Blue optional.
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I am a Commodore PET --- Now get off my lawn you kids...
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