The drop shot sinkers are a well known tool by specialist freshwater fishermen.
Lately they have been re-discovered by saltwater specialist as well, both for drop shot fishing and also for different kind of use, like the one shown in the images as main weight for the 4" Virago soft plastic
Weight: 3/16oz (5,25g), 1/4oz (7g), 3/8oz (10,5g)
10 units per blister