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As a car filters manufacturers, RockFilter with below features:

1. Premium quality Polyurethane, soft with strong toughness, filter fit tightly
with filter housing, seal well with the housing
2. Enough folded paper with enough filtration area to reduce fuel consumption.
3. Dehumidification and moisture proof.
4. Excellent air permeability with low airflow resistance.
5. Premium dust holding performance with long life time
6. Stable quality during whole warranty quality period.