OLFA® EXCEL BLACK™ takes blade sharpness to the next level. OLFA's secret, advanced production process makes this blade 25% sharper than ENDURANCE™ blades (which are already very sharp!). You can really feel the difference as your cutter glides through the cutting surface with ease and precision. Not only do the blades last much longer than conventional blades, they give you clean cuts that show off the quality of your work, making them ideal for any heavy-duty cutting task where the finish is important, such as contract wallpaper cutting. The 18mm EXCEL BLACK™ blade is 0.5mm thick and has 8 snap segments.