Double-layer air filter designed with DT-1 foam technology, which provides maximum airflow and maintains critical engine protection. The Super Seal base eliminates the need for grease, offering the cleanest and most efficient seal on the market. All DT-1 air filters are handmade in Belgium, using double, triple, and evolutionary grade foam. DT-1 air filters are available standard or pre-oiled with high-quality biodegradable fire-resistant filter oil. Standard air filters made from 15mm high-quality double-layer foam, specially designed for each airbox and filter cage, ensuring the best fit and performance.