The Freud shim set is precise, and is anodized with a dark material to prevent corrosion.  There are four .004, two .008 two .012 and two .020 shims in the package. They seem flat and true.  The only problem I have  with this set is that they all look the same.  Can you tell the difference  between .008 and .012? I can.... with a micrometer. If you don't have one,  you will have trouble telling the shims apart. There are some other sets  that use color coding. These might be easier for some people to use. I like  the fact that there are extra shims of each thickness (particularly the  .004), since they could be damaged easily.