Paper Accents Card & Envelopes are acid free, lignin free, buffered, and archival quality. The cards and envelopes are heavy cardstock. Decorate with rubber stamps, rub-ons, stickers and much more. Package includes 12 - 4 1/4 x 5 1/2 inch cards, fine encapsulated glitter that does not flake off or make a mess, and 12 white flat flap envelopes. Glitter Black.