Premium Inkjet Semi-GLOSS Paper (for office, photos, etc…) NOT LASER printable. Great for art proofs FiberStone® is a completely TREE FREE paper that uses no water, no bleach and ½ the energy of traditional virgin paper. It is made from 80% Calcium Carbonate (CaCOз) with a small quantity (20%) of non-toxic resin (HDPE- High Density Polyethylene). The Calcium Carbonate comes from limestone collected as waste material from existing quarries for the building and construction industry. It is ground up down to a fine powder like chalk and the HDPE acts as a binder for the Calcium Carbonate. Together these materials create a substrate that is both water and tear resistant!