Tramontina Century Wood KnifeThe Century Line knives have been especially designed for intense use. They receive a thermal treatment which consists of hardening (heating the blade), subzero (cooling from 50 to 196 degrees), and tempering (increasing the steel elasticity) for a longer and more efficient life. Made of polycarbonate and fiberglass, the handle is directly injected on the steel bolster and finalized with aluminum rivets. The Century Line has a 25 year warranty