This is a selection of pages from Vision's web site in 2013. The first two pages give an idea of the Vision Metron component system. The third page gives a reasonable run-down of the Vision Metron 10 speed derailleur, complete with colourful red and white branding.
Note that the Vision Metron derailleur is claimed to weigh 131g. This is not my experience. Mine weighs 186g, which a mere 55g more!
Browse associated derailleurs.
Vision Metron (VT800) 2013?