Fender Stainless 350's strings deliver the high output and aggressive tone that's ideal for heavier styles, such as hard rock and heavy metal. The stainless steel construction also creates a string with an increased lifespan. The pure Stainless Steel wrap has the highest resistance to oil, acid and sweat for long life and great bright tone. The stainless steel wrap stands up to vigorous playing and resists humidity, perspiration, skin oils and acids without losing punch or superior magnetic qualities. Made of the same material as the bridge sections on Fender American Standard guitars. Gauge Light - 09, 11, 16, 24, 32, 42.