The material was leathered steel grey granite.
The owner had a grill ( not pictured) in the opening on the left, and the unit on the right was a cooler.
Materials for Outdoor Countertops
Granite, soapstone, concrete, and tile are typically the most popular materials for outdoor countertops. Each has its own specific look and benefits, but all countertop options require some level of maintenance. Most outdoor countertops will need periodic sealing.