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The Wooster 4-1/2" Jumbo-Koter Pro/Doo-Z 3/8" Nap Roller Cover, supplied in a set of two, is an ideal choice for smaller painting projects and confined locations. With a 3/8" nap, it's ideal for painting smooth to semi-smooth surfaces such as walls, cabinets, and trim. Wooster's "Jumbo-Koter Pro" line is designed for ease of use and agility, making it excellent for rapid touch-ups and detail work. The "Doo-Z" fabric provides great paint pickup and release, allowing for a smooth and fast application. These roller coverings are popular among both DIY painters and experts because to their high quality and ease of use.