This OLFA® endurance rotary blade cuts TWICE as long as our standard rotary blades. The expertly honed tungsten tool steel blade with proprietary metal chemistry is designed to cut twice as long to extend the time between blade changes, saving you time and money! The replacement blade fits any OLFA® 45mm rotary cutter you already own. * The blade holds its edge twice as long as regular OLFA® rotary blades * Made of high-quality tungsten tool steel * Fits any OLFA® 45mm rotary cutter.