More information18mm cutting blade For cutters: L-1, L-3, L-5, L5-AL, NL-AL, PL-1, EXL, BN-L, OL, CL, LL, ML, CS-2 , CMP-2, BSR-200, BSR-300, BSR-600, NOL-1, XL-2, DL-1 · Made of superior quality steel · All Olfa blades go through a hardness adjustment process, sharpening angles, dimensions and other conditions in order to obtain the best balance between initial sharpening and long life. Black Excel Black is sharper but has a slightly shorter life.