This roller frame comes with a 4 in. x 3/8 in. mini roller cover and may be used with a 6 in. mini roller covers as well. Revolutionary Fabric designed for thin coatings. 10 times the retention of standard rollers. 360,000 micro fibers/sq. in. Distributes more evenly. Dramatically reduces splatter and drip. Smooth to semi-smooth surfaces. High pick up and release. Great for walls, ceilings and concrete. Good for all paint and stains. Covered end paints corners.