What do “P” and “W” stand for?
All gauges lighter than .018 are plain steel, all heavier than .026 are nickel wound.
On gauges where we overlap, a “p” signifies plain steel, a “w” signifies a wound string.
So, if you see a .020w, that’s a wound string. A .020p is a plain string. If it doesn’t have either letter we only offer it as a wound string (if it’s heavier than .026) or a plain steel string (if it’s lighter than .018). Got it? Good.