The Ironclad Sharpening Steel is durable, sustainable, and really innovative. The beautiful off-white handle is actually a plastic substitute made from sheep's wool. The surface of the steel is a No. 3 Cut. A general-purpose sharpening etch that's coarse enough to tackle even the dullest blade in your kitchen. The black steel holds the sharpening texture longer and doesn't rust. Like all of our products, the Ironclad Sharpening Steel is made to last and comes with a lifetime guarantee.