Non-woven belts are made of an abrasive impregnated nylon material that is often used for the scratch pattern it leaves. It leaves a very uniform scratch pattern typically used in applications where a satin finish is desired.
Light to moderate pressure pressure is recommended for most of the material grades. Keep in mind, a lighter hand may be needed on the coarse grade as it can remove significant material if used too firmly.
This 3" x 21" belt is a common belt size on the portable Porter Cable 352VS, Black and Decker Dragster, DS321 & many more machines.