Omnigrid's Glow-Line Tape allows you to highlight fine lines on rulers, making repetitive rotary cutting easy. Simply apply to the back of your ruler and once you are done, throw it away. Glow-Line Tape won't leave residue on your ruler, so it's easy to apply and remove from rulers. Each pack contains three rolls of 1/4" x 21-yards of pink, yellow, and orange tape.