All our cornices are manufactured of highest quality polystyrene material. We manufacture and import three different qualities. The first being extruded polystyrene cornice. This the best quality and smoothest finish. We also have Medium density polystyrene cornice. This is essentially hot wire cut from blocks of polystyrene giving it a medium texture which can be covered up with paint to give a smooth finish. Our final low density polystyrene cornice is also hot wire cut from a block of polystyrene; this is a grainier and has a more textured finish. Most of the cornices we manufacture can be simply glued over the existing cove cornice already installed on your ceiling.