Medium River Rock is a small, multicolored decorative stone used for sitting areas, paths, and landscaping as well as many drainage applications. It is approximately 1" to 2" in size. This makes Medium River Rock great for:
River Cobble is a multicolored decorative stone used for ground coverage and drainage. It comes in a large range of sizez - between 2" and 9" - that's great for filling an area with a decorative stone while getting a more natural range in sizes.
#57 Limestone Gravel is a very commonly used gravel for a large number of applications. Its angular shape helps it lock in place, its relatively small size makes it easy to move, and it still has enough graps when spread or compacted to allow a large amount of water to flow through it.