What an extremely cool strand of ancient metal beads. We can't tell you very much about these -- but they appear to be ancient bronze, most likely from somewhere around Mali. Are they hundreds of years old? thousand? Impossible to know for sure!
There are twenty beads on the strand, which measures about 24 inches long. Beads average about 1.5 inches long (or 30 mm). The vast majority of the beads are really showing their age. Many of the ends are broken or cracked, and the remainder show extreme wear. But what a beautiful patina!