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 24" surface conditioning belt is common on many portable belt grinders such as the makita 9924DB, porter cable 360VS & many others.