Constructed of crystalline ceramic, zirconium, the cutting edge of a Rock-N-Hold Ceramic Knife ($TBA) stays sharp for ten times longer than standard metal blades. This award-winning series from Silicone Zone are rustproof, stainproof and corrosion-free, leaving no funky smell nor after taste during food preparation. Rock-N-Hold knives are built with silicone handles and will be available in various types, such as chef, slicer, utility, santoku and paring. [source]