5, Reflective road stud (21 beads and 43 beads, can be combined into the aluminum and plastic road stud) By function: 1, Ordinary road stud; 2, Solar road stud; 3, Tunnel cable road stud; 4, Wireless road stud. By the number of reflective surface: Single-faced road stud and double-faced road stud. Adhering to the operation concept of “High