In the injection moulding world, a T0 is the very first part from the tool, and establishes that it is capable of moulding something. While I was excited to finally get my hands on these, there were a few issues. 1. The shaft is too long. It was supposed to be 4-3/4″ long. These are 6″. 2. The colors are way off. I have spoken to the design team and they are working on getting both these things corrected in the T1 samples which should be arriving soon.