Simple covers made of dark gray acid-free paper, with neutral pH, with 120grs / m2 or 170grs.
 Acid-free, flax-free paper, pH 8.0, oxidation resistance between 1-2, calcium carbonate reserve greater than 4%
 Available in the following sizes: A4 (305x215mm); A5 (215x155mm); Folio (345x220mm); Folio L (365x250mm); A3 (425x305mm)
 Sold in packs of 50 or 100 units.