Purdy's most popular roller covers … use with all paints and exterior stains， especially where a smooth， lint free finish is desired. WhiteDove™ 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. WhiteDove™ covers feature thousands of miniature flagged filaments so paint leaves from thousands of tiny surfaces for a smooth， virtually perfect finish. The high density acrylic fiber is also capable of carrying large quantity of paint， leading to improved efficiency and productivity.