Newtone Heritage strings are designed to a have a low tension that is as close to equal as possible across all the strings. They use phosphor bronze windings on round cores with special core/wrap ratios to give you extremely playable low tensions. Newtone Heritage sound like regular phosphor bronze strings, but they are just easier to play. These Newtone acoustic guitar strings are also good for vintage instruments that cannot stand up to standard tension strings. You can find Newtone Heritage 12-string sets in our Newtone 12-string section at http://www.juststrings.com/newtonetwelvestringguitar.html. Very important: Do not cut these wound strings to a desired length without first making a sharp bend into the string behind the cutting point or until the string is secured and tuned to pitch. Without either of these, the string will unravel.