The Camillus TigerSharp Replacement Blades includes 4 3.35" 420J2, Silver Titanium Bonded blades. 420J2 is a stainless steel that has a low carbon content and has a high chromium content, making it a shock absorbing steel that bends instead of breaking. The 420J2 has excellent resistance to corrosion, high stain resistance and fair edge holding capability. Titanium Bonded is not painted or plated, but an application of a unique formulation of titanium and chromium nitride to the surface of cutting blades that actually penetrates and treats the metal to create a permanent bond. The patented Titanium Bonding process provides the following benefits; corrosion resistance, adhesive resistance and the process itself makes the stainless steel 3x harder than untreated stainless providing a blade that stays sharper longer.