3dRose db_31003_2 100Th Birthday Party Red Design Memory Book, 12 by 12-Inch 11.5 x 11.5 Inch spiral bound hard covered 1 inch Twin Loop Wire Binding Spines 35 pages, 11.4 x 11.2 Inch - page thickness is 63lb cover Acid free bright white paper, non-coated paper Pages lay flat when book is opened