IF you have to be extra fussy about soldering, there's simply no better solder than Kester. Unfortunately much more expensive than other brands. Some of them come close to Kester in quality, but not quite. This pack is marketed as a low cost alternative to the full roll. Not as much smoke as others and solder is extremely effective in electronics. No problems in use and a strong sense of security when the job is done. I have no hesitation in giving this Kester solder a full FIVE STAR rating and