Art Canvas Panels (4x4) classroom Pack of 24 small canvas boards 4"x4" - 24 pack classroom size canvas panels. Canvas Panels are pre-primed with acrylic gesso. These panels are acid-free. They have turned edges and are glued on the back For use with oils, acrylics, tempera, and mixed media ready to paint 100% Pure Cotton Artist Canvas mounted onto Acid Free Heavy Board