Clairefontaine developed Pastelmat to meet the specific expectations of the most demanding pastel artists. Acid-free and pH neutral, Pastelmat Sheets are affixed onto heavyweight 360 gsm stock. It is also an ideal surface for pencil and charcoal. - Clairefontaine Pastelmat Sheet - 19-1/2" x 27-1/2", Charcoal Grey, 1 SheetPastelmat, ANTHRCT 19.5X27.5 SHT -