.OLFA SKB-10/10B Dual-Edge Replacement Blades for SK-10 Safety Knives, 10 Pack Olfa dual edge replacement blades are made of high quality carbon tool steel.
.OLFA RSKB-2 Round Tip Replacement Blades for SK-4, SK-6 & SK-9 Safety Knives Olfa dual edge replacement blades are made of high quality carbon tool steel.