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The Wooster 4" Super Doo-Z 3/16" Nap Roller Cover is a professional-grade paint roller cover designed for a variety of painting tasks. It measures 4 inches in width and is perfect for small or intricate surfaces that require precision. Made with Wooster's Doo-Z material, known for its durability and superior paint pickup and release, this cover features a 3/16-inch nap that is suitable for smooth to semi-smooth surfaces.