Rol-Vac-BL Film is Metallized Polyester Film with high transparency.  Used mostly in the lamination and board lamination, it is available with several different surface treatments including but not limited to Corona, Chemical, & No Treatment.  This film more commonly is metallized to a standard metal layer of 2.2 optical density.  It traditionally provides gloss readings in the 710-780 range and the base film has a haze level of 2.4 or less.