The Purdy Marathon Nylon/Polyester 18 in. W X 3/8 in. Paint Roller Cover paint roller is our most durable and productive knitted cover, made with a blend of nylon and polyester. Designed to hold more paint so you can paint farther per dip, this applicator is best for semi-smooth to semi-rough surfaces. Highlights: Features polypropylene core for durable, consistent painting edge For interior or exterior applications. Offers optimum balance between coverage and maneuverability Handcrafted in the USA with global materials Specifications: Dimensions (Overall): .38 inches (H) x 18 inches (W) x .38 inches (D) Weight: 41.28 ounces Package Quantity: 1 Material: Polypropylene, Polyester, Nylon