Twin Airs breakthrough, fused-dual-layer design (now widely copied) combines performance and protection.
The fused layers of open-pore foaming fine inner foam trap even the smallest particles. The new, rounder design and minimised shorter seams boost airflow.
Twin Air filters are assembled by hand and inspected for a perfect fit - Reusing a Twin air filter 40-50 times is common.
A Pre Oiled filter is submerged in Bio Liquid Power Oil and massaged to ensure all the pores are evenly coated. Its then placed in a temperature-controlled room to allow the oil to cure. You just have to install it and use it.
The Fire Resistant version has a backfire-resistant foam layer laminated to the filter which eliminates the restrictive, stock backfire screen
Check out the following Twin Air videos