MouthPeace Original Filters remove resin, tar, and other contaminants, to provide a cleaner, smoother, better-tasting puff, every time: no airflow restriction, and no loss of the good stuff. MouthPeace Original triple-layer activated carbon Filters were developed over 16 months to provide a cleaner, smoother, better tasting puff, while removing resin, tar, and other contaminants that cause caughing and harsh tasting hits. Carbon Filters generally allow 4-7 large hits per use.