The Ultimaker CPE+ 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 CPE+ (co-polyester) is similar to Ultimaker CPE, but tougher and with greater resistance to temperature. Ultimaker CPE can withstand temperatures of up to 70 °C, while Ultimaker CPE+ can withstand temperatures of up to 100 °C.