For large or small projects these Rotary Blade will meet all of your needs. It's great for quilting, sewing, and all your craft projects. Made from high quality tungsten steel, Olfa edge retention and sharpness have no equal. These razor sharp blades are capable of cutting through 6 layers of fabric effortlessly; saving you time and preventing muscle fatigue. 10 Blades per package. Compatible Models:Original 45mm Rotary Cutter (RTY-2/G), Deluxe 45mm Rotary Cutter (RTY-2/DX), and Quick-Change 45mm Rotary Cutter (RTY-2/NS).