When you're in a tough situation you need your equipment to work and work right! With TigerSharp's patented RES (Replacement Edge System) you never have to worry about you knife not being ready for duty. If your TigerSharp knife ever dulls you can simply and quickly replace the cutting edge in a matter of seconds without any special tools or skills. Not only will your knife always be sharp and ready it is not limited in its duties. Every TigerSharp knife comes with one smooth and one serrated GIN 5 cryogenically treated cutting edge that is hardened to a class leading 61-62 RHc.