Set%20of%20six%20Japanese%20420J2%20stainless%20steel%20replacement%20razor-blades.%20Each%20blade%20is%20precisely%20heat%20treated%20and%20hand%20finished%20to%20a%20surgically-sharp%20cutting%20edge.SpecificationsJapanese%20420J2%20Rockwell-C%20hardness%3A%2057Blade%3A%203.5%20in%20%2F%208%2C9%20cmPROP%2065%20WARNING%20FOR%20CALIFORNIA%20RESIDENTS%20%3A%20This%20product%20contains%20chemicals%20including%20chromium%20which%20is%20known%20to%20the%20State%20of%20California%20to%20cause%20cancer%2C%20birth%20defects%2C%20or%20other%20reproductive%20harm.%20https%3A%2F%2Fwww.p65warnings.ca.gov%2F