This is our “top of the range” model & the super reflective surface (95 to 97% reflection) is vapor coated with molten glass and titanium dioxide. PVD / Ceramic coated. This is the most reflective & most durable reflective surface known to science at this time. It will maintain full reflection for up to 20 yrs. This is the range that has been sold in the USA & Canada since 2008 & in Australia, Europe & the UK since 2003.