Calendars are printed on 80# or 100# gloss or matte paper for the inside pages, and 100# gloss or matte cover for the outside cover. 80# text is a bright weight, medium text weight paper. 100# text is a bright weight, heavy text weight paper. 100# cover is a heavy weight cover stock that is UV coated on the outside for protection and a beautiful finish. You cannot write on products with UV coating.