Smooth seating with an industrial vibe. As its name suggests, the Mixx Barrel Accent Stool by Urbia is a round, clean-lined piece made of fiber-reinforced concrete. Not only is the concrete material exceedingly durable and solid-looking, but it actually has a surface patina that deepens with time and use. Use this accent stool as supplemental seating or even as a small side table in a living room or other lounge area, indoors or out.