Strong reflective function and good adhesive. Make youe car looks very cool when your driving or park. The sticker can reflect at night or the darknness, very beautiful. Details: 10"(suitable for some small size scooter), 12"(suitable for some scooter), 18"(riding motorcycle).Glow-in-the-dark introduction: under natural light, solar lighting, ultraviolet irradiation,storage the light energy, glows at night or darkness, and brightness decay slowly, at the end of the light disappear.