Pigment rich Gesso primer makes the acid-free, archival cloth used to make this stretched canvas is beautifully responsive to every brushstroke. Balanced absorbency and tooth provides good adhesion and uncompromised color vitality. The unprimed cloth is 8.85 oz. (300gsm) and finished cloth weight is 16.93 oz. (480gsm). The stretcher bars are made from heavy-duty kiln-dried solid pine wood rigorously tested for warp resistance. Each canvas is flawlessly finished with back stapling and uncut corners for extra cloth if needed.