This trim roller refill is for use with a four-inch cage frame or mini handle and is for primers, exterior stains, industrial coatings, adhesives, and sizings. It is four inches long with a 3/8-inch nap and is designed for use with latex, oil, or alkyd paints on any type of surface. This trim roller has a plastic core and the cover is made of woven fabric. Available in a pack of two.