Makara Windmills 2 Available Poster Sizes: A4, A3, A2, A1, A0 Printed on matte archival, museum-quality paper, FSC-certified, in off-white and uncoated. Acid-Free: pH above 7 to prevent yellowing over time. Paper Weight: 250 gsm (110 lb), Thickness: 0.29 mm (11.4 mils).