The latest range of lower cost A4-size transparent overlays, now expanded to 11 colours to give the broad choice recommended by experts. These A4 overlays are ideal for reading larger texts, sheet music, etc.
The overlays have a shiny side and a matt side to provide improved usability over a range of lighting conditions. Reading from the shiny side gives a subjectively crisper appearance to the underlying text, but can reflect overhead lighting. The matt side trades slightly decreased clarity for less reflection.