45mm Quilting Rotary Cutter Replacement Blades | Pack of 12Incredibly Sharp Easily slash through fabric with these incredibly sharp Japanese steel blades. Even tough materials are no match to the power of the Rotary Blades. With one sweeping movement, slash through up to four layers of fabric like a samurai, with authentic Japanese steel! Durable Stay on the cutting edge for longer. The rotary Japanese steel blades are incredibly tough, resistant, and durable, outlasting other brands. They simply stay sharp.