Two side acrylic Plastic ReflectorsDesigned to provide enhanced, dependable road guidance to motorists in bad weather conditions. Made out of strong ABS moulded body with Polycarbonate/PMMA (Acrylic) Micro Prismatic Reflectors ultrasonically welded on the moulded ABS body much better than glass beads markers. These are visible from long distances. These are installed with Epoxy - Resin based adhesive or special hot melt bitumen adhesive avoiding nails etc. which can have a harmful effect on the road. Meets or exceeds ASTM D-4280 / Morth standards.