Circular rotary replacement blades for Olfa's 45 mm rotary cutters are used for quilting, sewing and general crafts. These blades are made of high quality tungsten carbide steel for unparalleled sharpness and superior edge retention. Cuts up to 6 layers of fabric. Olfa 45 mm x 0.3mm set of 5 spare blades for the RTY-2G and RTY-2DX rotary cutters.