Colorado River Cobbles are around 3"-5" in size and much like some of the other river cobbles and river rocks, can add some much-needed color to a landscape project. These naturally smooth rounded river cobbles are shaped by flowing water over thousands of years. They are usually red, pink, black, grey, brown, and tan in coloration. This particular size of Colorado River Cobbles usually come in palletized wire baskets, but super sacks and 75lb bags can be available as well.