Reflective glass beads are divided into ordinary glass beads and high refractive index glass beads. Ordinary glass beads aremainly used for road coatings with refractive index greater than or equal to 1.5. High refractive index glass beads are mainlyused in reflective fabrics, such as traffic police clothes, highway signs and other places. Refractive index is between 1.9 and2.4.