Fender® Super 7250's Nickel-Plated Steel (NPS) Roundwound strings combine the high output and dynamic sound of steel with the smooth feel of nickel. The result is a string with bright highs and a thunderous low end. Fender® Super Bass 7250's are an excellent all-purpose bass string. They are particularly good for Rock, Funk, and any style in which the bass needs to cut through.