The Ultimaker PC filaments come in 2.85mm diameter only, the roundness and the diameter is very constant.
These are the new spools with NFC for the Ultimaker 3. Of course it can be used on any other printer!
They come on a reel of 750g and the filament length is approximately 90m
Ultimaker PC (polycarbonate) is a very strong and tough material that can be used for various engineering applications.