1, Lower Vehicle's speed 2,warning color , yellow and black, is ey catching. 3,reflect some bright light in the evening Model: SD-001Size: L250 x W 350 x H 50 mmWeight: 14kg/mEnd: L175 x w 350 x h50weight: 1.65kg/pc endCharacteristics:1. The rubber speed Hump can lower vehicle's speed when the car passed by, and the driver has no feeling of being hit.2. in the daytime, it is waning color, yellow ...