Occasional use of these pellets will help keep your air rifle working properly between cleanings. Simply fire a felt pellet as you would a normal pellet to remove dirt, lead and fouling from the barrel.Occasional use of these pellets will help keep your air rifle working properly between cleanings. Simply fire a felt pellet as you would a normal pellet to remove dirt, lead and fouling from the barrel. Maintain the performance and accuracy of your air gun barrel.