WoodlandPRO Narrow Kerf chainsaw bars are designed to take advantage of .325" pitch narrow kerf technology, which will give your chainsaw additional cutting performance as compared to a standard bar and chain. The bars are slightly thinner than standard chainsaw bars to match WoodlandPRO narrow kerf saw chain. It takes less power from the saw to make the same length of cut with a narrow-kerf bar/chain cutting system than with a standard bar and chain. These bars are made of three silicon manganese alloy steel plates that are electrically welded together. The center plate has been hollowed out to reduce weight. Rails are induction hardened for a long life. Sprocket nose tip contains high quality Swiss bearings and is held in place with 4 sturdy rivets.