Fredrix Pro Series 100% Belgian Linen Archival Canvas Board is a professional quality archival painting panel. They are constructed with a rigid 1/8" thick hardboard core wrapped in 100% Belgian Linen and primed with acrylic-titanium primer. The overall thickness is approx. 3/16". They are acid-free and archival. Good for Oils or Acrylic. These are an excellent choice for Plein Air painting.