Pea gravel can be defined as gravel consisting of small, smooth, rounded stones the size of peas, hence the name. This pebble blend will pass a 3/8″ screen (9.5mm) and be retained on a No. 4 (4.75 mm) sieve. It is used in landscaping to provide a soft, uniform natural look and pathways that are very comfortable to walk on. It is used as a driving surface and in construction for aggregate concrete cells and surfaces. We carry pea gravel from several sources in southern Arizona. Manufacturing processes and product tones and shape of the pebbles very. View all “gravel” sizes and pricing here.