GHS Infinity Bronze IB30L Treated Acoustic Guitar Strings Light 12-54 - .012 .016 .024 .021 .042 .054. If you're looking for strings that are vibrant, lively, and last a long time, try these GHS Infinity Bronze coated Light acoustic strings. The proprietary coating helps ensure long life while preserving the strings' rich tone. • MFSKU IB30L • UPC 737681200114