Malibu Premium Belgian Linen canvas is uniquely sized three times, and primed with a single thick layer of a special alkyd primer, giving a 13 oz. finished weight. The triple glue size gives the linen canvas excellent stability, and the alkyd primer provides a unique and highly absorbent surface for oil and alkyd colors. Linen is uniquely able to resist cracking and disintegration, as it retains its own natural oils and remains flexible over time. It is acid free and pH balanced.