Russian Keyboard Overlays, Stickers, Labels. White Characters, Transparent for Dark Color Keyboards Graphic May Vary. Russian White Overlays (White ink on clear overlay for black or Dark colored keyboards) Overlays are manufactured of durable Lexan.They won't tear, crack, discolor, or slip off even after years of use. The Overlay adhesive firmly attaches the overlay in place without damaging the keyboard key or the original key legend. If desired, Overlays may be removed without causing damage to the original key or the legend on the key. All printing is on the reverse side of the overlay so that the printing will not rub or scratch off in normal use.