I was very pleasantly surprised. These are nickel and there is a good difference between these and other nickel strings, they seem to last reasonably well too. I use these on Harley Benton PB-20 SBK Standard Series. Great for punkrock, for "old school" stoner, acid rock etc. The sound is clear, "elastic" bottom, good middle, top without much ringing, but there is no lack of high frequencies. I use these strings first time as i was concerned about something cheaper.
Damn excellent value for money.