RAZOR SHARP 45mm ROTARY BLADES - These 45mm blades are made from high-quality tungsten tool steel for unparalleled sharpness and superior edge retention. The long lasting precision of these blades allows you to work longer uninterrupted..CONTAINS 2 CIRCULAR BLADES - Each refill pack contains 2 ultra-sharp 45mm rotary replacement blades. These blades are available in quantities of 1 Blade (RB45-1), 2 Blades (RB45-2), 5 Blades (RB45-5), 10 Blades (RB45-10), and 500 Blades (RB45-500)..COMPATIBLE WITH 45mm ROTARY CUTTERS - Our RB45-2 45mm Rotary Blades are compatible with most 45mm rotary cutters. However, these circular blades perform best when equipped with an OLFA 45mm Rotary Cutter..HEAVY DUTY CUTTING - These blades provide detailed and precise cutting of a wide variety of materials including fleece, felt, wool, cotton, leather, suede, foam, vinyl, and more. They cut up to 8 layers of material in a single pass..THE OLFA STANDARD - As the original inventor of the Snap-Off Knife, OLFA has maintained a standard of cutting excellence for our quality and durability. Pairing your OLFA 45mm Rotary Cutter with OLFA 45mm Rotary Blades will provide optimal results.