It looks like the brake levers that @
Lbxpdx is posting a picture of looks to is painted black. The black paint is in poor condition.
Use paint remover to remove the black stuff. Follow up with sanding, Scotchbrite or similar abrasive.
It is also possible that this is powder coat, but it look like paint to me.
Whether there is anodizing on there I cannot say. But once you have the black off, you can repaint if that is your goal. If you want to get a polished finish and think that the finish is anodized then you can follow one of the above solutions.
By the way, there is a way to check if a piece of aluminum is anodized or not. Aluminum is electrically conductive. If you have a multimeter, set it to ohms and place the two probes on a the surface of the aluminum part. If the aluminum surface has no anodizing the reading will be under 2 ohms. If the part is anodized it will be well above 2 ohms, likely in the k-ohms range or higher.
Don't insert the points of the probes into the surface because the sharp point may penetrate through the anodized layer. Just touch the surface.