Endeavours Art Store has found this Canadian-made cotton duck stretched canvas to be the least likely to warp of any brands we've ever stocked. Gallery Canvas features a 1 1/2" Profile, Regular Canvas features a 3/4" profile. No additional primer required. 7 oz 100% cotton canvas on 3/4 in. thickness stretcher bars - Double-primed with gesso for a finished weight of 15 oz - Suitable for oil, acrylic paints and mixed media applications - Back stapled.