Artwork with bleed is not possible with Pantone printing because the envelopes are pre-manufactured and arrive from the paper supplier already folded and glued. The exact size of each envelope can vary by up to 1/16" or .0625", so if there are envelopes that are slightly larger, a white line could show at the edges. For this reason, any artwork that is supplied with bleed will have the bleed removed and a white margin added.