Cuts up to 6 layers of fabric. These blades are made of high quality tungsten steel for unparalleled sharpness and superior edge retention. For Original 45mm Rotary Cutter (RTY2), Deluxe 45mm Rotary Cutter (RTY2DX) and Quick-Change Rotary Cutter (RTY2NS). 2 blades per pack. Used for RTY2 and RTY2DX2 blades per pack carded.