Double roller frame is uses 2 foam rollers 4 inches wide. Unique double roller design allows for painting twice as fast because it holds twice the paint and helps to eliminate roller skips. For smooth, semi-smooth and semi-rough surfaces. For latex, acrylic, and alkyd paints. Does not leave unsightly fuzz, lint or seam marks. Foam conforms to surface irregularities and provides contour coverage. Will not mat down. Carries most of the paint below the surface in thousands of tiny open cells. Less frequent dipping and less spreading out of paint. Cleans quickly and easily.