Cut up to six layers at a time like the pros do with this OLFA rotary blade. You ll save precious time and effort. The blade is made of tungsten tool steel and retains its sharp edge so you ll also save money. The blades fit any OLFA 45mm rotary cutter and come in a plastic storage case that doubles as a container for safe disposal. Perfect for hobbies as well as projects at the office or home they are ideal for cutting fabric paper vinyl upholstery and more.