This is a set of Wahl No.8.5 Full Toothed Competion Series clipper blades which will leave a 3mm depth cut. The competition Series of Blades from Wahl have a 'Corrosion Inhibitive Finish' which give superior protection to prolong blade life. Made from high carbon steel making them some of the hardest on the market which is why they are used mainly by professional animal groomers. They are made for using with the Wahl and Moser clippers but will fits other makes of clippers that use the same type of 'snap-on' blades like Andis and Oster. Like all clipper blades they should be kept well oiled and be cleaned thoroughly before & after use.