Buck folding blade knives differ from the fixed-blade knives Buck is famous for. Some are manufactured to Buck's exacting specifications outside of the United States, but all are covered by Buck's limited Lifetime Warranty. The stainless steel used in Buck's pocket knives is 420J2, which is well suited for everyday carry knives. The blades are easily sharpened and are not as brittle as hardened steel blades, which break more easily, especially in the smaller blade sizes. General-purpose 420J2 stainless blades are also corrosion resistant and provide a good blend of hardness and wear resistance. The larger sheath-carry knives utilize 420HC high carbon stainless steel blades for longer edge retention and corrosion resistance.