Paper Accents Card & Envelope Sets are ready to personalize. Use stickers, rubber stamps, brads, eyelets, buttons, punches, and more. They are acid-free, lignin-free, buffered, and archival quality. Cardmakers Choice 5"x 7" 100lb White 20pc- Cards are scored and ready to fold to 5"x 7". Contains 20 each of 100lb heavyweight cardstock cards and white 24lb A7 envelopes. Acid free.