Low Tack will not leave residue on your ruler. Glow Line makes it easy to find measurements and shapes, especially when rotary cutting repetitive pieces. You can use Glow-Line either underneath or on top of the ruler. Select the color you prefer and apply tape over the desired measurement on back of the ruler, then trim even with ruler edge. When cutting strips, automatically look for the highlighted line or area, preventing the common mistake of cutting the wrong size. When finished using, simply pull tape off of ruler and discard. Glow-Line Tape, 3 rolls of 1/4" x 21 yds transparent fluorescent tape, by Omnigrid.