From the manufacturer:
One of the most versatile sheets Strathmore offers, this cream colored drawing paper is ideal for sketching and most finished work. Medium surface readily accepts pen and ink, pencil, charcoal, crayon, and markers. Smooth surface, with its non-reflective finish and uniform formation, is especially suited for line drawing and technical work. 80 lb. (24" x 36" x 500 sheets) 130 g/m paper, recommended for graphite pencil, colored pencil, charcoal, sketching stick, pen & ink, marker, soft pastel, mixed media, oil pastel. Acid Free