Outdoor Edge RazorSafe System Gutting Blades (4-pack) - DESCRIPTION These razor gutting blades made from Japanese 420J2 stainless steel open game like a zipper without piercing vital organs. Each blade is precisely heat treated and hand finished to a surgically-sharp cutting edge. Set of four. SPECIFICATIONS Japanese 420J2 Rockwell-C hardness: 57 Blade: 3.9 in / 9.9 cm PROP 65 WARNING FOR CALIFORNIA RESIDENTS This product contains chemicals including chromium which is known to the State of California to cause cancer, birth defects, or other reproductive harm. https: //www.p65warnings.ca.gov/