A precision-made roller cover for use on all interior or exterior semi-smooth to rough surfaces. Use with all flat, eggshell, and satin paints. Unmatched quality for unloading with smooth, even release. Polypropylene core is solvent-resistant. Available in nap sizes 3/8 In. to 1 In. Do not leave cover soaking in water or paint solvent for prolonged period of time (over 48 hours).