Are you sick of rotary blades that aren't sharp enough? If so, turn to the most popular size of OLFA rotary blades, the OLFA 45mm RB45-1 Tungsten Steel Rotary Blade. With the power of high-quality tungsten steel, this blade cuts through eight layers of cotton with ease. Whether you're working with paper, fabric, or leather, use this blade to create precise edges without giving yourself a headache. For best results, use an OLFA Self-Healing Rotary Mat at all times. Comes in packs of 1, 2,5, or 10.