Mac knives are known as some of the sharpest knives & are endorsed by some of the top chefs in the world, including Thomas Keller, Charlie Trotter, Nobu Matsuhisa, Eric Ripert and more. Mac knives very sharp, razor-like edges for easy slicing, they're hard so they stay sharp longer (Rockwell 57-61), are well balanced and are a good value. Mac Knives have a 25 year limited warranty from the manufacturer.