The Art1st pad is perfect for Pre-K and grade-school student artwork, sturdy enough for a variety of wet and mixed media. This heavy-duty paper is acid free, helping to prevent yellowing and fading, preserving student artwork for even longer. Sturdy sheets are perfect for wet and mixed media. 90-lb watercolor paper comes in an economical package. Acid-free paper won't fade or yellow over time. This drawing paper is 12" x 18" in a pack of 50 sheets.