Mineral paper is made from 80% calcium carbonate which provides a unique surface for water based or dry media. A great alternative to wood-based paper. Tear-resistant, foldable, and non-wrinkling. Will not bleed through, even when soaked. Mineral paper is a great surface for almost any media wet or dry, and can be ink jet printed (results will vary depending on the printer). Its bright white vellum like surface allows for crisp lines, saturated colors and just the right amount of absorbency for a wide variety of creative techniques. Acid free. Bright white. Not recommended for oil-based paints or oil pastels. 20 sheets per pad. 100lb/150 gsm.