Oster Cryogen-X Clipper Blades available in a wide variety of sizes. These blades stay cooler for longer, revoluntionary blade design to stay sharper for longer. 
 
Here is a guide for how long each blade size cuts dogs coat to:
50 = 0.2mm
40 = 0.25mm
30 = 0.5mm
15 = 1.2mm
10 = 1.5mm
10 Wide = 2.4mm
9 = 2mm
8 1/2 - 2.8mm
7F = 3.2mm
7 = 3.2mm
5F = 6.3mm
5 = 6.3mm
4F = 9.5mm
4 = 9.5mm
3F = 13mm
3 = 13mm
5/8" = 0.8mm
 
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