Quali-Tech 9MF050 RollerLite Microfiber Professional Standard Synthetic Textured Roller Cover, 9" by .5" .5-inch nap for textured surfaces 9-inch perfect for crown molding, textured walls, interiors and exteriors such as previously painted surfaces, sand-grain plaster, mildly textured metal, and natural wood 1.5-inch core rollers extruded from a single polypropylene tube, provide strength and durability