This flap wheel from Dremel is a great tool for finish removal and light material clean up. They are less aggressive than sanding bands as they don't bite into the material as fast. Because of the flaps, they tend to run a little cooler than sanding bands and are therefore less likely to burn into your material.
You can use these flap wheels for grinding or polishing flat or contoured surfaces. They are at their most effective when they are used as a finishing sander after your heavier surface sanding and material removal has been completed.
They can be used on a variety of materials such as aluminium, brass, copper, hardwood, softwood and even plastic.