This board features a distinctive white core, and is highly recommended for all artists. Besides being a designer board with a wide variety of colors that can complement any picture, this board is conservation grade made of 100% virgin alpha-cellulose surface paper, core and backing paper. Select is a 4 ply board that is both lignin-free and acid-free and is buffered with calcium carbonate to an alkaline reserve of 3-5%. Colors are fade and bleed resistant so they last as long as your art. For artists seeking a deep bevel we also offer 4 white shades in 6 ply board. All boards are 32x40" in size.Minimum of 25 assorted boards for 4 play and 15 for 6 ply.