Tip: when you get your finger spool, unreel the line to make sure it's tied at the end (mine wasn't). Otherwise, if you drop the spool you may lose it.I know Dive Tech (1000 islands not Grand Caymen) has them for for $25. Online I don't know who has them. Anyone that carries Akona I would imagine.The string is 25' long.
I also blackened the string with a Sharpie at 15' (one mark) and 25' (two marks).