Name:31glass beads Reflector:31glass/plastic beads reflector Size:74.7*13.9mm Weight:7g/pcs Material:ABS+high light glass bead Life:5years Visual range:800-1000m Use install on different road stud Packing:300/bag/1000pcs/carton Carton Size:23*33*44 cm 1000pcs Material: plastic film, white glass bead reflections.Used for all kinds of nail reflectors.