We have four different Tremolo Spring Sets- If you have a few guitars it pays to have a few of each on hand
SOFT- Weaker springs that allow for all 5 pieces to be installed and still have good tremolo action
MEDIUM- The standard springs as shipped in most new Stratocaster style guitars.
STRING- A Stiffer spring to give your guitar some extra brightness and sustain.
STAINLESS- Made of real stainless steel- these give most guitars a crisper edge and a bit more "Air" in the sound. Tension wise they are similar to our "MEDIUM" Set