These 45mm Olfa rotary blades cut up to six layers of fabric at a time, saving you precious time. Because the blade is made of tungsten tool steel, it retains its sharp edge, saving you money. Good For: cutting strips and multiple layers at once. Cuts fabric, paper, tarp, vinyl, upholstery and more. Made from high-quality tungsten tool steel. Fits any Olfa 45mm rotary cutter.