The natural toothy surface of Colourfix paper is ideal for pastels, pencil or charcoal, as it will hold multiple overlays of color without the need to fix between layers. Each sheet is 140 lb., acid-free and professionally screened with ArtSpectrum pastel primer. The absence of fixative will allow the velvet bloom and vibrant color to be preserved. The 9" x 12" sheet packs come in an array of assorted colors.