D'Addario XSABR1356-3P 3-Pack XS 80/20 Bronze Acoustic Guitar Strings Medium 13-56Features XS 80 20 Bronze strings are the brightest and longest lasting of any DAddario coated acoustic guitar string, thanks to the ultra thin XS film coating. 80 20 wrap wire provides bold, bright acoustic tone, with crisp projection that can fill a room. With a NY Steel core and Fusion Twist technology, XS 80 20 Bronze offers greater break strength and unmatched tuning stabilitystaying in tune 131% better than other acoustic strings. XS 80 20 Bronze