20 strips of reflective tape for optical and laser tachometers, specially formulated self adhesive reflective tape for use as a target for optical tachometers. Its highly reflective surface is designed to retro reflect the light (infrared, laser or visible) emitted by the optical tachometer. It will improve the detection of the rotating object from a wide range of angles and distances. It will work with any laser or photo tachometer offered on Amazon.