Superb blend of polyester and knitted wool designed for maximum paint pickup and release. Excellent 1 coat coverage with oil and latex paints. Ideal for paints, stains, urethanes and cements. Heavy-duty polypropylene core withstands water and solvents. For use on semi- rough surfaces. Premier KODAWOOL 8.87-in x 1/2-in Nap Knit Synthetic Blend Paint Roller Cover Polyester | R9KW2-50