CNC = Computerized Numeric Controlled machining.... In modern manufacturing such as with bicycle components, it is LESS EXPENSIVE to CNC many components where there are critical tolerances (like the bores, mounting surfaces and interfaces between moving parts) on hydraulic brakes. It'd cost a fortune and take for ever to manually machine those one at a time, and if you chow just ONE cut, you throw away not only the material, but the time you put into machining every cut before it. Even the cheapest, pot-metal parts often have CNC'd dimensions. I hate that terms such as "CNC" and "billet" are thrown around to imply some sort of quality, when in reality, it mostly represents "knock-off-Gucci" Fred.