These are the greatest electric guitar strings ever made. The pure nickel wrap combined with the bullet ends make a HUGE difference in performance on every level. The bullets add increased sustain and low-end response (which you can really FEEL in your gut), extra tuning stability, and reduce breakage tremendously. Even though nick-plated steel is probably the most commonly used wrap (like Fender's 3250 Super Bullets - which are also fantastic), the PURE NICKEL wrap is second to none for the vintage purist or veteran Stratocaster user. These strings are more powerful and musical than any other I've experienced in my 25+ years of playing. I put these babies on my 1982 Fullerton-era '62 RI Stratocaster and plug directly into my original 1964 Deluxe Reverb for a truly mind-blowing guitar experience! Shockingly good - but that's what you get with Fender!