Acoustic Guitar Strings by Orphee; RA-039H(.012 - .053 gauge) Medium Light set - 90/10 Phosphor Bronze wound; Individual Vacuum Packaging Ensures Superior Quality and Oxidation Proof Ensures Long Lasting Life Orphee Medium gauge guitar strings : .012, .016, .024, .032, .042, .053 Strong durability with the vigorous and deep timbre Sounds warm and bright acoustic tone Oxidation Proof and High-quality Phosphor Bronze for long life HASSLE-FREE MONEY-BACK GUARANTEE: If for any reason you are not 100% satisfied, within 30 days, please return your Orphee's Acoustic Guitar Strings for a no-questions asked, full refund.