Inner surface polishing is available for small diameter pipes from the minimum inner diameter of 0.1mm. Our polishing can make a highly smooth surface and precise roundness required in medical or analytical equipment for suppressing contaminants. Various surface treatments are also available; such as Teflon coating having excellent insulation property and water/oil repellency, F2901-coating having water-clear color and thin coating thickness of 1 μm or less, and gold plating for inner surfaces having inactive property and excellent resistance against corrosion and abrasion.