It looks like this Part has been superseded by LEGO Part 56823 String Cord Thin [Undetermined Length].
Click on a colored part below to see the Sets and MOCs that use part 14728 String Cord Medium Thickness [Undetermined Length] in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
There are 4 Mold variations of part 14728 - String Cord Medium Thickness [Undetermined Length] in the database, in use between 1987 to 2008. See Molds and other related Parts.