The 3mm aluminum rod is made of a long aluminum solid bar. The bar will be cut in 129mm for each piece. After cutting, the bar will be cnc machined to 128mm for length and 28mm for diameter. It will also be done anodizing. After anodizing, it will be cnc machined again to have 2 different colors, i.e. black and silver. At last, the bearing will be pressed in the top.