The blue color Premium Lighthouse stockbook?with clear acid free interleaves cointains 64?black?card?stock?pages,?9?clear?strips?per?page?and?double?CLEAR?interleaves.? These stamp stock albums lie completely flat, a feature a linen binding and padded?cover?made?with?"Lefa"?material?(regenerated?leather?with?85%?natural?leather?fibers?and?other?sustainable?raw?materials,?such?as?natural?tanning?agents,?natural?latex,?natural?fats?and?dyes).?A4?format?(9?x?12")Slip case sold seperately.