The Pro knives are Zwilling's top of the line German Knives.  They are made with German Special Formula Steel and ice hardened.  They are also forged from one piece of steel. These benefits translate to durable, sharp, flexible knives that will last a lifetime - and that's what the warranty is, lifetime.  Every knife your would ever need is in the block and I love that you get 6 steak knives not the usual 4.  Superb value.