Interior NS TOOLS  paint roller description and specification Interior paint rollers are tools used to apply a thin and even layer of paint on interior walls. They consist of a roller head covered in fabric, which is attached to a long handle. The roller head is usually made from either foam or polyester material and can be purchased with different nap sizes depending on the desired finish and surface texture. The longer handles allow for easier painting at higher heights without having to use ladders or scaffolding. Interior paint rollers are typically used in combination with an appropriate primer, as well as paints that contain low levels of volatile organic compounds (VOCs) for better indoor air quality.