2pk 4" roller cover. Unique surface of these rollers will allow you to paint 30% faster. Paint sticks to the wall, not to the roller. Roller cover cleans fast with quick rinsing. Use with all paints using 3/8" nap on semi-smooth surfaces or 1/4" on smooth surfaces. 2 rollers per pack. 3" covers fit on standard 3" frame and model No. 03941 nonstick coated trim kit frame. 4" covers fit on standard 4" roller frame and model No. 03942 nonstick coated trim kit frame. 4"