DT-1 RACING EUROPE AIR FLTR EVO RMZ 450 EVO-170-18NODT 1s world class foam technology delivers maximum airflow whilemaintaining critical engine protection, Their Super Seal base eliminates the need for grease and creates thecleanest and best seal on the market, All DT 1 Air Filters are handmade in Belgium with the highest quality bonded dual, triple and evolution foam available, DT 1 Air Filters come standard or pre oiled with highest quality flame resistant bio degrable filter oil, SUPER SEAL STANDARD