What is the material of the round pier on the roadside?

The round pier on the road is made of granite.

In order to prevent other vehicles from passing through the zebra crossing, these stone piers also play a protective role. They separate people from vehicles, which will greatly reduce the occurrence of traffic accidents and protect pedestrians. And the traffic is very complicated now. Some people don't obey the traffic rules, and the cars on the road are on the rampage. These stone piers also play a role in protecting passers-by.