the 10 inch razortooth saw blade goes through four manufacturing processes for maximum durability and hardness, friction reduction and making extremely fast and efficient cutting. the saw blade has triple-ground impulse-hardened teeth for two times more material removed per stroke. the sk5 blade cdontains more carbon, which means harder steel, allowing the blade to stay sharper longer. the chrome-plated blade reduces friction and improves efficiecy. it comes with a limited lifetime warranty. replacement parts are also available.