These set of frames are NOT STANDARD or badly coated.
The coating is on some places too thin causing the grey colour of the metal (galvanised steel) underneath to shine through which makes the colour of the frame on some areas grey-white and/or the coating is thicker in some places. With use of sandpaper and some abrading (scouring of) the latter can be solved.
Although most of the parts of the rings is worked away in the lamp shade, we can not sell them as standard white coated set of frames.
Besides the colour and/or coating thickness issue, there is nothing wrong with these frames which have following characteristics: