Plus the steel band is machined using CAD and this thing looks to beautiful to be machined. I mean the actual frame has 0 blemishes. The only blemishes people have pointed out were not part of the frame but the parts added afterwards.
Stainless Steel Band Created from our own alloy, then forged to be five times stronger than standard steel, the CNC-machined band is the mounting point for all the components of iPhone 4. The band provides impressive structural rigidity and allows for its incredibly thin, refined design. It also functions as both iPhone 4 antennas.