The cut indicates the uniform length of hair which will be left when you use the designated blade.
Usually, higher blade numbers indicate shorter length ie: A #4 blade leaves 3/8 inch of hair, and a #40 leaves only 1/100 of an inch. For lengths longer than ½", use a blade guard or comb.
New Cryogen-X with AgION Antimicrobial Dog Clipper Blades
Oster is the first blade manufacturer to incorporate AgION antimicrobial into the surface of their Cryogen X blades. AgION antimicrobial uses silver, a powerful metal ion, as the active ingredient to effectively control the growth of bacteria, mold, and mildow. AgION provides the important protection needed when grooming animals one after another.
If AgION® antimicrobial is on it, milliions of bacteria aren't.
For the really big jobs or to speed up heavy clip-downs, be sure to see the Take Down Quick (TDQ) Blades