I assume they're aluminum, but I couldn't find their webpage to confirm it. How do you like the knife, by the way? If they are aluminum, anodizing is a bit tricky. Anodizing aluminum basically opens up pores on the surface of the material and hardens the surface at the same time. To color the anodized layer, a dye has to be used. It is much easier to anodize reactive metals like Niobium and Titanium because they use only electricity to develop colors, rather than heat, electricity, and dye. If they are aluminum, there are anodizing services around, but it would probably cost more than the $35 knife did to begin with.