Check the listing for details. Elixir 16027 Phosphor Bronze Nanoweb acoustic guitar strings, Cust Lt .011-.052. Condition: New. Listed at 19.99 USD. DESCRIPTION A typical, uncoated guitar string is made of a metal core (usually steel) and includes a metal winding on the heavier gauges. As you play your guitar or bass, the string will quickly accumulate oils, dirt, sweat and bits of skin that get trapped between the windings. The unprotected string starts to corrode the metal and begins to 'deaden' the sound of the string. FEATURESElixir Phosphor Bronze with Nanoweb coating guitar strings use a protective fluoropolymer coating to cover the string via a patented processCoating is actually a microscopic sleeve that protects the stringEntire surface of the string is coated including the gaps between the windingsLast 3-5 times longer than uncoated stringsLess time changing strings and more time playing SET 1st 2nd 3rd 4th 5th 6th 16002 Extra Light .010 .014 .023 .030 .039 .047 16027 Custom Light .011 .015 .022 .032 .042 .052 16052 Light .012 .016 .024 .032 .042 .053