Purdy 144688182 Contractor 1st Roller Cover, 18 inch x 3/8 inch nap Medium Density Polyester Made in US Smooth to Semi-Smooth Surfaces Designed for use with all latex and oil-based paints Medium Density Polyester (Knitted), 1-1/2" Polypropylene Core Coating Type: Latex and Oil-Based Paints and Primers Sheen Type: Flat, Eggshell, and Satin Project Type: Drywall, Ceilings, and Concrete Materials: Knitted Medium Density Polyester