HomeRight Roller Cover, 3/8" nap: * Shed resistant roller cover * Roller cover nap is made of polyester * Roller cover core is made of polypropylene * 9" premium perforated roller cover for smooth and semi-smooth surfaces such as drywall and plaster * Use with PaintStick EZ-Twist, PaintStick, power rollers and other pressure-fed paint applicators * 3/8" nap is best for smooth surfaces and materials such as latex and oil-based paints and primers