Customer Rating: - Much better than old auto-feed systems I've used
This is a refill for the grass hog, in my case the 18V rechargable version. I remember countless other trimmers that would jam up their auto-feed mechanisms, or, worse, have only a single piece of wire that had to be replaced every 15 minutes or so. This thing works very well, and after a couple months of use so far, have not had to replace the spool. And at the same time there is always sufficient length of wire to do the job - not sure how this one is so much better than other trimmers, but it is.

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Customer Rating: - Nice replacements
A little high priced, but nice to have three spare spools. Now, I'll just buy string and respool myself, much cheaper.

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Customer Rating: - Easy to change
This 3-pack is a bargain. It was so easy to change the spool. Not like my old gas powered trimmer. This just pops in and presto you are on your way to work. I particularly like the fact that with the Black and Decker battery powered trimmer there is no need to bump to feed more line - it's automatic. Truly the best I've ever owned.

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Customer Rating: - Replacement String
Amazon had it cheaper and in stock where local stores didn't have it. I would check Amazon first in the future.