The perfect marriage of economy and quality! Extraordinarily sturdy to resist warping, these canvas panels are an incredible value. They are crafted to our exacting standards from 5 oz 100% cotton canvas that is double primed and adhered with an acid-free adhesive. Their acid-free core is made from a cellulose by-product that is an ecologically renewable resource. Each panel is approximately 1/8" thick and is individually wrapped.