Tha's "glass beads" made by Potters Corp. in USA. Watch also this video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-e_bJyp8qa5E.htmlsi=Agg7KeXJH8ldg8S2&t=1111 Potter's glass beads are used in road markings and striping to enhance visibility, especially during low-light conditions or at night. These beads are retroreflective, meaning they reflect light back towards its source (such as a vehicle's headlights). This improves the visibility of road markings, making them more noticeable to drivers and enhancing overall road safety. Visit Potters Corp. at www.pottersindustries.com/
