Andis UltraEdge Clipper Blades are available in a variety of sizes. All Andis blades are specially treated steel to extend edge life, chrome finish to prevent rust.
 
Here is guide as to what length each blade cuts coat to:
3 3/4 = 13mm
40 = 0.25mm
30 = 0.5mm
15 = 1.2mm
10 = 1.5mm
8 1/2 = 2.8mm
7FC = 3.2mm
7 = 3.2mm
5FC = 6.3mm
5 = 6.3mm
4FC = 9.5mm
4 = 9.5mm
 
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