... photo album and rigid box Black card paperSpecifications:Black cardboard paper is used for the case of hardcover, file ... both sides same degree darkness 4.pure pulp black card papeSubs and size :80g-550g ,normal size:787 ... can be avalible useage:the black card paper can be widely used for the case of hardcover, file ... be printed any logo and pattern. black card paper for hardcover case,album,rigid box