OLFA® EXCEL BLACK™ takes blade sharpness to the next level. OLFA's secret, advanced production process makes this blade 25% sharper than ENDURANCE™ blades. Not only do the blades last much longer than conventional blades, they give you clean cuts that show off the quality of your work. The 9mm EXCEL BLACK™ blade is 0.38mm thick and has 13 snap segments. The plastic pack has a useful section which you can use to snap off and safely store used blade segments. Packed in boxes of 10.