ACOUSTIC GUITAR STRING SET 2-Pack of DSA-11 DRAGON SKIN acoustic guitar string sets. Clear Coated Phosphor Bronze Acoustic Guitar Strings on Hexagonal Cores. Phosphor bronze with clear coating on hexagonal cores. Custom Light. 11-15-22-30-40-50. Dragon Skin sets feature a coating on all strings, including the brass-plated steel high strings for greater volume and warmth. DR's notable and patented K3 Technology coating produces more volume, fewer unwanted harmonics, greater clarity, and articulation than standard uncoated strings. They provide the same protection against corrosion and perspiration, as well as the longer tone life for which coated strings are known.