Cass Art Canvas Board provides a high-quality alternative to using stretched canvas. They are durable and more portable making them perfect for al fresco painting. These canvas boards are triple-gesso primed, with a medium grain surface making them perfect for all forms of Oil, Acrylic and mixed media applications. High quality, dependable alternative to using stretched canvas. Triple Gesso Primed. SOLD IN PACKS ONLINE AND INDIVIDUALLY IN STORES.