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DR Strings Dragon Skin K3 Coated Phosphor Bronze Acoustic Guitar Strings are another addition from DR Strings to feature the K3 proprietary coating. The coating is Patent Pending. With K3 coating, players have noticed the strings are louder than the other coated strings on the market, and that they last longer as well which is great news for acoustic players! All six Dragon Skin acoustic strings are coated, even the plain ones.