Stringsite.com's strings are all Electric Nickel Wound which concist of a steel alloy plated with nickel. This method of manufacturing brings several advantages: The strings get a nice crisp and "round" sound as well as being more consistent and restistant to oxidation (rust) than 100% steel strings. Finally the nickel plating provides a softer feel to the strings which reduce finger noise (screech when moving across the strings) and also give longer life to both strings and frets.
Strings for 7 stringed guitars are also below. If you want other gauges please click "Single Strings / Custom Sets" in the menu.