The most important feature for engine protection is the "filtering ability". This quality filter media for a motocykel oil filters is produced by few companies worldwide. Oil filter papers are generally made of a blend of cellulose (pulp) and other types of fibers, like synthetic fibers. The introduction of synthetic fibers improves the the filtering efficiency and its resistance to high temperatures and pressure. All MIW filters meet OEM efficiency requirements in order to allow higher maintenance intervals and extended engine life.
Components of spin on filters
Ahlstrom Paper from Finland. The heart of a good filter.