Class=Size
Rating=Quality
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Example.
A Cobra has Class 4 D rating Thrusters.
An upgrade for Class 2 A rating thrusters are available. They prove to be underpowered for the ship despite a good rating and light weight.
A Class 4 A rating set of thrusters is also available. They improve on the ships max mass immensely, it moves much faster, and the players wallet is now crying.