Embedded Aluminum Solar Road Stud Item No.: RSAS-F2-IN (two way)-F(Flash) -S(Steady) RSAS-F1-IN (one way)-F(Flash) -S(Steady) Key Features: For centre line, slip road and other heavy traffic use Only 6.5mm above the road surface 40 tons compression resistance 500m visible Spot lighting: flexible solar panel aluminium alloy+Polycarbonate