American Crafts-Holiday Remarks Envelope Seals: Chalkboard Noel. Customize, title or label just about anything with these unique stickers! This package contains twenty-four 1-1/2 inch round envelope seal stickers with the same design on each. Acid free. Archival quality. WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm- do not mouth or chew. Imported.