Road Stud–RUICHEN Solar Stud Suppiler. Road Stud. Aluminum Solar Studs With Shank R1. Load Bearing: More Than 30 Tons. Warranty: 18 Months. Body material: GB Cast Aluminium alloy. Power supply: USA Brand Flexible High Efficient Solar Panel (2.5V/0.38W) Visual distance: > 800m. Working Mode: Flashing or Constant. Waterproof: IP68. Aluminum