Fettling knives are excellent tools for cutting slabs of clay, separating molds from greenware, and much more. They can trim, cut, shape, form, construct, pierce, decorate, spread, carve, scrape, shave, slice, mince, and dice. Like the scrapers, they won’t rust too! We recommend the Kemper fettling knife for use by children. Some fettling knives are stiff while some are not (can curve and bend into desired angles).