- Constructed of a unique, open-cell polyurethane material that allows maximum airflow while still providing superior filtration
- Made in the U.S.A.
Beta -- 450 RR -- (2010, 2011, 2012, 2007, 2008, 2005, 2006, 2009); Beta -- 525 RR 4T -- (2006, 2008, 2005, 2007, 2009); Beta -- 250 RR 4T -- (2005, 2007, 2008, 2006); Beta -- 450 RR 4T -- (2009, 2011, 2005, 2007, 2010, 2012, 2006, 2008); Beta -- 250 RR -- (2008, 2009, 2011, 2005, 2007, 2006, 2010, 2012); Beta -- 525 RR -- (2006, 2010, 2007, 2008, 2009, 2011, 2012, 2005); Beta -- 400 RR 4T -- (2009, 2010, 2006, 2008, 2011, 2005, 2007, 2012); Beta -- 400 RR -- (2006, 2009, 2010, 2008, 2012, 2005, 2007, 2011)