These Pro Solutions 4 in. mini roller covers with 1/2 in. nap are made to meet professional quality standards. Containing tightly woven, lint-free fabric to deliver a smooth, professional finish for any project. Ideal for use with all sheens of interior and exterior water-based, oil-based, and alkyd paints, primers, stains, and clear finishes. Application: Smooth and semi-smooth surfaces like drywall. 2 pack.