DR Rares are hex core (like most strings), DR Sunbeams are round core with a compression wrap. The round core gives a very long sustain (in most cases) and improved flexability, the compression wrap adds mass and helps keep "stuff" out of the coils producing a longer life and clean resonance. BTW Sunbeams won out in a 8 brand several month long recording test I did a year or so back but of course like all things guitar, personal preference is, well, personal. The string hunt is great fun and cheap entertainment, especially if you make it a project.
Last edited by Michael T; 12-11-2009 at 07:33 AM.
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