Traditionally, chisels are made from a metal such as tempered steel. While the angles may vary, the blade edges are typically bevelled, allowing for a thinner point of contact on an otherwise thick blade. This allows the user to exert a fair bit of force on the chisel, either by hand for detailed work, or with a mallet for larger scale chiselling. It also wears down the edge over time, meaning anyone working with steel should know how to sharpen chisel blades.Slice safety ceramics—made from 100 percent zirconium oxide—last up to 11 times longer than steel, so it’s unlikely you’ll need to sharpen your Slice blade any time soon. Even if you could (our blades are sharpened on diamond wheels), we don’t recommend sharpening our blades because you won’t be able to achieve our safer finger-friendly edge at home.