I can't figure them out I don't get all the size variances.They were supposedly used for nets as well as fish lines.Once you start adding all the possibilities.The type of water conditions....ocean,lakes, slow moving streams,faster moving rivers,a lot of variables here.This site I'm at there's a possibility they were used in the pursuit of swordfish which blows my mind.The smallest plummet I found I was told they find in cemetery contents...a lot of options to consider.Let alone some of the non-water options....mjm