Safe for passenger cars! UV resistant. Excellent cold resistance. Even at -4°F (-21°C) it does not sound like iron plates. Size (W x D x H): 24.0 x 10.6 x 3.9 inches (610 x 270 x 100 mm); Material: Polyethylene resin; Weight: 4.4 lbs (2.1 kg); Color: Dark Gray; Accessories: 1 bolt, 1 nut, 1 washer. *Each accessory is attached to the main unit.