Adamas Phosphor Bronze Light, .012 - .053, Environmental Packaging, 1818Estar rating 5Bruce QuinnJanuary 1, 2010Tried a lot of different manufacturer's strings, all the typical choices....these sound the best! The acoustic guitar involved is a Yamaha FG-750S, sort of a full size jumbo, etc. Finally, a noticeably superior sound with these 1818 Adamas strings!