UArt Sanded Pastel Paper Pads are flip-pads that hold 10 acid-free, pH-neutral sheets of paper, separated by acid-free glassine sheets that protect work from smudging and flaking. The 400 grade has a moderate "bite," while the 600 grade is super fine. Both accept many layers of hard or soft pastels, yet also work well with other media. The low-profile surface allows for easy erasing e.g. Sabretooth, La Carte Pastel 12 sheets (or equivalent quality)