Kind of rubber. On the one hand, handling is at a height, both in the rain and on dry pavement. On the other hand, two huge minuses: 1. Noise, like an airplane taking off. I'm not particularly sensitive and don't drive an s-class, but it's a real bust. 2. It pushes water, in deep puddles, forward, you need to get used to it, to put it mildly (water in the washer is not needed, it is from puddles, all on the glass) . . In general: the price corresponds to the quality.See full review