Olfa replacement blade for 45mm Cutter Tungsten steel blade Expertly honed for sharpness Cuts up to eight (8) layers of cotton For use with most 45mm Rotary Cutters The Industry Standard in Sharpness No matter the project, let OLFA 45mm RB45 Tungsten Steel Rotary Blade be the answer. With over 40 years of experience crafting the best blades, this ultra sharp rotary blade will not let you down. Our most popular blade combines the strength of high-quality tungsten steel with expert honing for a blade that cuts up to eight layers of cotton with ease. Paper, fabric, leather and more, this blade can tackle them all - crafting precise edges and clean cuts. For best results, pair this rotary blade with an OLFA Self-Healing Rotary Mat for all cutting. Independent testing shows that using an OLFA rotary blade on an OLFA cutting mat cuts up to 470 more yards of fabric than the leading competitive brand. Blades come in a convenient plastic case for easy storage or disposal.