The tube has the hexagons throughout the surface, the layout of the hexagons is in the specific series and consequence, the thickness of the pipe is only 2mm, our engineering team spent two days to design the programming, upon the first pc was made out and the inspection result was great, the engineering team was very happy, the beautiful girl from our administration depart presented a bouquet to congratulate them, the engineering team put the flowers into the pipe and took the photo for the valuable memory.