A grade pins are considered perfect or near-perfect and as the artist envisioned/designed them. All A grade orders will come with a free 3in vinyl sticker of the same design.
B grade pins have minor and/or cosmetic flaws, and do not come with the sticker.
C grade (or worse) pins have major flaws and/or numerous minor/cosmetic flaws, and also do not come with the sticker. These are VERY RARELY available, as our manu's tend to be pretty fantastic in their consistency and quality, and any C's (or worse) IF they do pop up tend to be too flawed to be sold.