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 to an acid-free core. Each panel is approximately 1/8" thick and is individually wrapped. - Blick Studio Cotton Canvas Panel - 14" x 18", Pkg of 514X18 5PK -