|Description from Amazon FRANCE|
.012 .016 .020w .027 .037 .050 - set / Jazz Guitar (E-Guitar) Nickel Flat Wound with Ball End Jazz Swing Series - ideal for semi acoustic and acoustic Jazz guitars. Mellow timbre, powerful sound. "Reference standard" flatwound Jazz strings. Favoured by Jazz professionals worldwide. They feature a true round core which vibrates freely with no preferred motion axis. The flat ribbon windings are highly polished pure nickel. For a supple and responsive feel. Silk-wrapped ends anchor the windings for extended playing life.