Museo II is the new 2-sided version of the worlds finest acid free fine art inkjet paper. Museo II is made from 100% cotton fibers (the purest source of cellulose) and is buffered with calcium carbonate to prevent environmental acidification (yellowing). All Museo II papers meet the demanding needs of the finest image makers, galleries and museums. Two sided paper is perfect as digital album pages, digital scrapbooking, digital book making, fine art printmaking and for artist or photographers portfolios. Best used in straight path printers. The 250 GSM weight (sub weight 67lb.) is available in 2 sizes 8.5 x 11, 13 x 19, Packed 25 sheets per box.