Yea they wont sell you a defective tire.
From interco.
"Tires that are reclassified as Blems are tires that were found at the final inspection stage to have some cosmetic imperfection. This can be something as minor as a tire with white letters having a letter that has some black showing in the white letter. "Cosmetic" refers to something that slightly affects appearance. Tires that have a more serious flaw are scrapped and never sold. "
