Bibtone FINEST U.S.A. Steel HQA 1253 HQ Acoustic Guitar String 12-53 BIBTONE Acoustic 80/20 Bronze Strings deliver a strong, deep bass response with extremely bright and crisp overtones. Bibtone strings are made with FINEST US Steel from U.S.A. for the highest quality and performance. String Gauge:1E : 012, 2B : 016, 3G : 024, 4D : 032, 5A : 042, 6E : 053 Corrosion resistant packaging to keep strings fresh. These strings are made from 80/20 Bronze (Phosphor Bronze Wound) which brings extremely brilliant sound.