Exposed-lens retroreflective tape with a pressure-sensitive adhesive, designed for use as expendable code marks in automatic warehouse or conveyor operations. The advantages are easy to see. 3M High-Gain Reflective Sheeting makes it easy to design sensing and control systems based on simple, inexpensive photoelectric sensors. 3M retroreflective materials are up to 3000 times as bright as a plain white surface, increasing contrast and readability. And unlike mirrors, they reflect light back to its source, so they dont need to be precisely aligned.