There are more Aluminum cleaning rods in use than any other kind. The only way Aluminum will scratch your barrel is if it becomes "charged" with something harder. Think about this. What is in a cartridge or shotshell that is harder than the steel in your gun barrel? Nothing. About the hardest thing a gun barrel will ever see is steel jacketed ammunition. That steel is extremely mild. Is has to be made softer than the steel used in the barrel, or it would remove the rifling, and send chamber pressure into the stratosphere. Benchrest shooters use steel rods, but they are plastic or Polymer coated. They use them simply because they are one piece, and much stiffer than Aluminum 3 piece rods, not because Aluminum "scratches". Bill T.