Art Advantage Canvas Board Recycled MDF 4"x 5" 3pc- Acid free, double-primed, 100% cotton canvas is glued onto warp resistant, medium density fiberboard. Canvas is wrapped around the board to provide clean, finished edges. Great value for the beginner to the professional artist, plus the thin profile fits into standard frames. For use with both acrylic and oil mediums. Each canvas board measures approximately .13" thick.