Made from high-quality tungsten steel, OLFA Endurance Rotary Blades are manufactured with a proprietary metal hardening process that delivers two times the cutting life when compared to standard OLFA Blades. That’s up to 1500 yards of cutting. Use Endurance Blades to extend the time between blade changes, saving both time and money. Cuts up to eight layers. Use to cut fabric, paper, leather, and more. Use an OLFA Self-Healing Rotary Mat to protect work surfaces and prolong blade life. Fits most 45mm handles.