These cards are ideally suited for soft pastels, charcoal, chalk, colored pencils, and white or opaque gel pens. Full size cards are 5″ x 6.875″ and come in packages of 10. Coordinating envelopes are included, and measure 5.25″ x 7.25″. Strathmore artagain paper is a fiber-enhanced sheet, which contains 30% post-consumer fiber. Acid free. Card paper weight is 60lb, envelopes are 80lb paper weight.