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This Rush Air filter uses premium U.S. long staple cotton in a stable sandwich of aluminum mesh. Long staple cotton has much longer "whisker" fibers extending into the airflow than other competitive materials. As air moves through the filter that is treated with the specialty filtration oil, the longer whisker is more active as it waves back and forth, sweeping the air, seeking out and capturing the passing dirt particles as they pass through the filter. The longer, more active, oil-treated "whiskers" provide greater filtration surface to attract and retain engine-damaging dirt, while optimizing airflow over conventional paper filters.