With over 30 years of history developing the perfect blade, OLFA 45mm Tungsten Steel Rotary Blades deliver exceptional sharpness with unmatched edge retention. The 45mm Tungsten Steel Rotary Blade is the most popular size, allowing for heavy-duty cutting through up to eight layers. Use the long-lasting blade to cut fabric, paper, leather, and more. Made in Japan Suits all 45mm Olfa Rotary Cutters. Our No. 1 Selling blade.