New U.S. tariffs on $18 billion in Chinese goods take effect Friday as trade tensions intensify between the world’s two largest economies.

The tariffs affect 14 categories of Chinese goods including green technology such as electric vehicles, solar panels and EV batteries — sectors that Beijing has prioritized as it tries to dig out from an economic slowdown. But experts say they are mostly symbolic since the U.S. imports relatively few of the affected products directly from China.