Strathmore 400 Series Toned paper 19 x 24" 80lb or 118 gsm pack of 25 sheets - Smooth - Cool Grey is acid free paper ensure longevity. Suitable for graphite, chalk, pastel, charcoal, sketching sticks, markers, china markers, colored pencils, pens, and white gel pens. Ideal for sketching & Drawing with light & dark media