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. Pack of 10. Available in sizes: A5 (5 x 7 in.) and Square (20 x 20cm). High quality, dependable alternative to using stretched canvas. Triple Gesso Primed.