Some people abroad figuratively call them "sleds" based on their shape. Some in China also call them "ducktails" or "spoilers." More scientific terms would be "spoilers," "spoiler wings," or "spoiler plates." Rear wings generally come in single-layer or double-layer configurations, made of aluminum alloy or carbon fiber. They can be manually adjusted or hydraulically adjusted. Hydraulic automatic models have additional hydraulic struts that automatically adjust their angle based on vehicle speed.
