Purdy's most popular roller covers use with all paints and exterior stains, especially where a smooth, lint-free finish is desired. White Dove Series features a high-density woven cover, made of Dralon, a derivative of nylon, which enables the paint to flow freely into and out of the cover for easy rolling and a high-quality finish. White Dove covers feature thousands of miniature flagged filaments so paint leaves from thousands of tiny surfaces for a smooth, virtually ideal finish. The high-density acrylic fiber is also capable of carrying large quantity of paint, leading to improved efficiency and productivity.